diff --git a/src/compiler.cc b/src/compiler.cc
index 575afaaf0b..7f8c28a867 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -546,7 +546,7 @@ static bool DebuggerWantsEagerCompilation(CompilationInfo* info,
 
 static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
-  ZoneScope zone_scope(info->zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(info->zone());
   PostponeInterruptsScope postpone(isolate);
 
   ASSERT(!isolate->native_context().is_null());
@@ -910,7 +910,7 @@ static bool InstallCodeFromOptimizedCodeMap(CompilationInfo* info) {
 bool Compiler::CompileLazy(CompilationInfo* info) {
   Isolate* isolate = info->isolate();
 
-  ZoneScope zone_scope(info->zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(info->zone());
 
   // The VM is in the COMPILER state until exiting this function.
   VMState<COMPILER> state(isolate);
@@ -1228,7 +1228,7 @@ void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag,
 CompilationPhase::CompilationPhase(const char* name,
                                    Isolate* isolate,
                                    Zone* zone)
-    : name_(name), isolate_(isolate), zone_scope_(zone, DELETE_ON_EXIT) {
+    : name_(name), isolate_(isolate), zone_scope_(zone) {
   if (FLAG_hydrogen_stats) {
     start_allocation_size_ = zone->allocation_size();
     start_ticks_ = OS::Ticks();
diff --git a/src/compiler.h b/src/compiler.h
index 53d0690f96..699c6d8af4 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -441,22 +441,22 @@ class CompilationInfoWithZone: public CompilationInfo {
   explicit CompilationInfoWithZone(Handle<Script> script)
       : CompilationInfo(script, &zone_, &phase_zone_),
         zone_(script->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(script->GetIsolate()) {}
   explicit CompilationInfoWithZone(Handle<SharedFunctionInfo> shared_info)
       : CompilationInfo(shared_info, &zone_, &phase_zone_),
         zone_(shared_info->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(shared_info->GetIsolate()) {}
   explicit CompilationInfoWithZone(Handle<JSFunction> closure)
       : CompilationInfo(closure, &zone_, &phase_zone_),
         zone_(closure->GetIsolate()),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(closure->GetIsolate()) {}
   CompilationInfoWithZone(HydrogenCodeStub* stub, Isolate* isolate)
       : CompilationInfo(stub, isolate, &zone_, &phase_zone_),
         zone_(isolate),
-        zone_scope_(&zone_, DELETE_ON_EXIT),
+        zone_scope_(&zone_),
         phase_zone_(isolate) {}
 
   // Virtual destructor because a CompilationInfoWithZone has to exit the
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 0a933dfd3e..07cb1ec9c6 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -284,7 +284,7 @@ void Deoptimizer::GenerateDeoptimizationEntries(MacroAssembler* masm,
 void Deoptimizer::VisitAllOptimizedFunctionsForContext(
     Context* context, OptimizedFunctionVisitor* visitor) {
   Isolate* isolate = context->GetIsolate();
-  ZoneScope zone_scope(isolate->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(isolate->runtime_zone());
   DisallowHeapAllocation no_allocation;
 
   ASSERT(context->IsNativeContext());
@@ -421,7 +421,7 @@ void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
   Isolate* isolate = context->GetIsolate();
   Object* undefined = isolate->heap()->undefined_value();
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
   ZoneList<Code*> codes(1, zone);
   DeoptimizeWithMatchingCodeFilter filter(code);
   PartitionOptimizedFunctions(context, &filter, &codes, zone, undefined);
@@ -438,7 +438,7 @@ void Deoptimizer::DeoptimizeAllFunctionsForContext(
   Isolate* isolate = context->GetIsolate();
   Object* undefined = isolate->heap()->undefined_value();
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
   ZoneList<Code*> codes(1, zone);
   PartitionOptimizedFunctions(context, filter, &codes, zone, undefined);
   for (int i = 0; i < codes.length(); ++i) {
diff --git a/src/gdb-jit.cc b/src/gdb-jit.cc
index 5717a96079..c9b0169db9 100644
--- a/src/gdb-jit.cc
+++ b/src/gdb-jit.cc
@@ -1917,7 +1917,7 @@ static void UnregisterCodeEntry(JITCodeEntry* entry) {
 
 
 static JITCodeEntry* CreateELFObject(CodeDescription* desc, Zone* zone) {
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
 #ifdef __MACH_O
   MachO mach_o;
   Writer w(&mach_o);
diff --git a/src/hydrogen-environment-liveness.cc b/src/hydrogen-environment-liveness.cc
index 8c660597ab..f7d47e1c15 100644
--- a/src/hydrogen-environment-liveness.cc
+++ b/src/hydrogen-environment-liveness.cc
@@ -37,7 +37,7 @@ EnvironmentSlotLivenessAnalyzer::EnvironmentSlotLivenessAnalyzer(
     HGraph* graph)
     : graph_(graph),
       zone_(graph->isolate()),
-      zone_scope_(&zone_, DELETE_ON_EXIT),
+      zone_scope_(&zone_),
       block_count_(graph->blocks()->length()),
       maximum_environment_size_(graph->maximum_environment_size()),
       collect_markers_(true),
diff --git a/src/hydrogen-gvn.cc b/src/hydrogen-gvn.cc
index 9d5e866de4..e3f740c177 100644
--- a/src/hydrogen-gvn.cc
+++ b/src/hydrogen-gvn.cc
@@ -366,7 +366,7 @@ HGlobalValueNumberer::HGlobalValueNumberer(HGraph* graph, CompilationInfo* info)
         info_(info),
         removed_side_effects_(false),
         phase_zone_(info->phase_zone()),
-        phase_zone_scope_(phase_zone_, DELETE_ON_EXIT),
+        phase_zone_scope_(phase_zone_),
         block_side_effects_(graph->blocks()->length(), phase_zone_),
         loop_side_effects_(graph->blocks()->length(), phase_zone_),
         visited_on_paths_(phase_zone_, graph->blocks()->length()) {
diff --git a/src/json-parser.h b/src/json-parser.h
index 152bd63716..1e7ebd8c9e 100644
--- a/src/json-parser.h
+++ b/src/json-parser.h
@@ -323,7 +323,7 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
   Handle<JSObject> json_object =
       factory()->NewJSObject(object_constructor(), pretenure_);
   Handle<Map> map(json_object->map());
-  ZoneScope zone_scope(zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone());
   ZoneList<Handle<Object> > properties(8, zone());
   ASSERT_EQ(c0_, '{');
 
@@ -469,7 +469,7 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
 template <bool seq_ascii>
 Handle<Object> JsonParser<seq_ascii>::ParseJsonArray() {
   HandleScope scope(isolate());
-  ZoneScope zone_scope(zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone());
   ZoneList<Handle<Object> > elements(4, zone());
   ASSERT_EQ(c0_, '[');
 
diff --git a/src/jsregexp.cc b/src/jsregexp.cc
index 7838c04a9e..42c9bb1477 100644
--- a/src/jsregexp.cc
+++ b/src/jsregexp.cc
@@ -170,7 +170,7 @@ Handle<Object> RegExpImpl::Compile(Handle<JSRegExp> re,
                                    Handle<String> pattern,
                                    Handle<String> flag_str,
                                    Zone* zone) {
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
   Isolate* isolate = re->GetIsolate();
   JSRegExp::Flags flags = RegExpFlagsFromString(flag_str);
   CompilationCache* compilation_cache = isolate->compilation_cache();
@@ -410,7 +410,7 @@ bool RegExpImpl::CompileIrregexp(Handle<JSRegExp> re,
                                  bool is_ascii) {
   // Compile the RegExp.
   Isolate* isolate = re->GetIsolate();
-  ZoneScope zone_scope(isolate->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(isolate->runtime_zone());
   PostponeInterruptsScope postpone(isolate);
   // If we had a compilation error the last time this is saved at the
   // saved code index.
diff --git a/src/liveedit.cc b/src/liveedit.cc
index a01e502300..f4e91a8508 100644
--- a/src/liveedit.cc
+++ b/src/liveedit.cc
@@ -1835,7 +1835,7 @@ static const char* DropActivationsInActiveThreadImpl(
     TARGET& target, bool do_drop, Zone* zone) {
   Isolate* isolate = Isolate::Current();
   Debug* debug = isolate->debug();
-  ZoneScope scope(zone, DELETE_ON_EXIT);
+  ZoneScope scope(zone);
   Vector<StackFrame*> frames = CreateStackMap(isolate, zone);
 
 
diff --git a/src/runtime.cc b/src/runtime.cc
index 86f7f0f430..70c55ca4a2 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -3601,7 +3601,7 @@ MUST_USE_RESULT static MaybeObject* StringReplaceGlobalAtomRegExpWithString(
   ASSERT(replacement->IsFlat());
 
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zone_space(zone, DELETE_ON_EXIT);
+  ZoneScope zone_space(zone);
   ZoneList<int> indices(8, zone);
   ASSERT_EQ(JSRegExp::ATOM, pattern_regexp->TypeTag());
   String* pattern =
@@ -3688,7 +3688,7 @@ MUST_USE_RESULT static MaybeObject* StringReplaceGlobalRegExpWithString(
 
   // CompiledReplacement uses zone allocation.
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zonescope(zone, DELETE_ON_EXIT);
+  ZoneScope zonescope(zone);
   CompiledReplacement compiled_replacement(zone);
   bool simple_replace = compiled_replacement.Compile(replacement,
                                                      capture_count,
@@ -4223,7 +4223,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringMatch) {
   int capture_count = regexp->CaptureCount();
 
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zone_space(zone, DELETE_ON_EXIT);
+  ZoneScope zone_space(zone);
   ZoneList<int> offsets(8, zone);
 
   while (true) {
@@ -6316,7 +6316,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StringSplit) {
   static const int kMaxInitialListCapacity = 16;
 
   Zone* zone = isolate->runtime_zone();
-  ZoneScope scope(zone, DELETE_ON_EXIT);
+  ZoneScope scope(zone);
 
   // Find (up to limit) indices of separator and end-of-string in subject
   int initial_capacity = Min<uint32_t>(kMaxInitialListCapacity, limit);
diff --git a/src/zone-inl.h b/src/zone-inl.h
index e312b20899..b2adc1796c 100644
--- a/src/zone-inl.h
+++ b/src/zone-inl.h
@@ -110,14 +110,14 @@ void* ZoneList<T>::operator new(size_t size, Zone* zone) {
 }
 
 
-ZoneScope::ZoneScope(Zone* zone, ZoneScopeMode mode)
-    : zone_(zone), mode_(mode) {
+ZoneScope::ZoneScope(Zone* zone)
+    : zone_(zone) {
   zone_->scope_nesting_++;
 }
 
 
 bool ZoneScope::ShouldDeleteOnExit() {
-  return zone_->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
+  return zone_->scope_nesting_ == 1;
 }
 
 
diff --git a/src/zone.h b/src/zone.h
index 128552a57a..cc03254d1e 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -39,13 +39,6 @@ namespace v8 {
 namespace internal {
 
 
-// Zone scopes are in one of two modes.  Either they delete the zone
-// on exit or they do not.
-enum ZoneScopeMode {
-  DELETE_ON_EXIT,
-  DONT_DELETE_ON_EXIT
-};
-
 class Segment;
 class Isolate;
 
@@ -237,7 +230,7 @@ class ZoneList: public List<T, ZoneAllocationPolicy> {
 // outer-most scope.
 class ZoneScope BASE_EMBEDDED {
  public:
-  INLINE(ZoneScope(Zone* zone, ZoneScopeMode mode));
+  INLINE(ZoneScope(Zone* zone));
 
   virtual ~ZoneScope();
 
@@ -245,17 +238,10 @@ class ZoneScope BASE_EMBEDDED {
 
   inline bool ShouldDeleteOnExit();
 
-  // For ZoneScopes that do not delete on exit by default, call this
-  // method to request deletion on exit.
-  void DeleteOnExit() {
-    mode_ = DELETE_ON_EXIT;
-  }
-
   inline static int nesting();
 
  private:
   Zone* zone_;
-  ZoneScopeMode mode_;
 };
 
 
diff --git a/test/cctest/test-ast.cc b/test/cctest/test-ast.cc
index c72f87ec3d..80b4d30193 100644
--- a/test/cctest/test-ast.cc
+++ b/test/cctest/test-ast.cc
@@ -41,7 +41,7 @@ TEST(List) {
 
   Isolate* isolate = Isolate::Current();
   Zone* zone = isolate->runtime_zone();
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
   AstNodeFactory<AstNullVisitor> factory(isolate, zone);
   AstNode* node = factory.NewEmptyStatement();
   list->Add(node);
diff --git a/test/cctest/test-dataflow.cc b/test/cctest/test-dataflow.cc
index ae3327965f..406d9038ff 100644
--- a/test/cctest/test-dataflow.cc
+++ b/test/cctest/test-dataflow.cc
@@ -37,7 +37,7 @@ using namespace v8::internal;
 TEST(BitVector) {
   v8::internal::V8::Initialize(NULL);
   Zone* zone = Isolate::Current()->runtime_zone();
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
   {
     BitVector v(15, zone);
     v.Add(1);
diff --git a/test/cctest/test-liveedit.cc b/test/cctest/test-liveedit.cc
index 2c89a387dc..1cb38b4175 100644
--- a/test/cctest/test-liveedit.cc
+++ b/test/cctest/test-liveedit.cc
@@ -96,7 +96,7 @@ void CompareStringsOneWay(const char* s1, const char* s2,
                           int expected_diff_parameter = -1) {
   StringCompareInput input(s1, s2);
 
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
 
   DiffChunkStruct* first_chunk;
   ListDiffOutputWriter writer(&first_chunk);
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index ac62b752c0..cb7c1ee692 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -72,7 +72,7 @@ using namespace v8::internal;
 static bool CheckParse(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   FlatStringReader reader(Isolate::Current(), CStrVector(input));
   RegExpCompileData result;
   return v8::internal::RegExpParser::ParseRegExp(
@@ -83,7 +83,7 @@ static bool CheckParse(const char* input) {
 static SmartArrayPointer<const char> Parse(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   FlatStringReader reader(Isolate::Current(), CStrVector(input));
   RegExpCompileData result;
   CHECK(v8::internal::RegExpParser::ParseRegExp(
@@ -98,7 +98,7 @@ static SmartArrayPointer<const char> Parse(const char* input) {
 static bool CheckSimple(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   FlatStringReader reader(Isolate::Current(), CStrVector(input));
   RegExpCompileData result;
   CHECK(v8::internal::RegExpParser::ParseRegExp(
@@ -116,7 +116,7 @@ struct MinMaxPair {
 static MinMaxPair CheckMinMaxMatch(const char* input) {
   V8::Initialize(NULL);
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   FlatStringReader reader(Isolate::Current(), CStrVector(input));
   RegExpCompileData result;
   CHECK(v8::internal::RegExpParser::ParseRegExp(
@@ -389,7 +389,7 @@ static void ExpectError(const char* input,
                         const char* expected) {
   V8::Initialize(NULL);
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   FlatStringReader reader(Isolate::Current(), CStrVector(input));
   RegExpCompileData result;
   CHECK(!v8::internal::RegExpParser::ParseRegExp(
@@ -473,7 +473,7 @@ static bool NotWord(uc16 c) {
 
 
 static void TestCharacterClassEscapes(uc16 c, bool (pred)(uc16 c)) {
-  ZoneScope scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope scope(Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
   ZoneList<CharacterRange>* ranges =
       new(zone) ZoneList<CharacterRange>(2, zone);
@@ -531,7 +531,7 @@ static void Execute(const char* input,
                     bool is_ascii,
                     bool dot_output = false) {
   v8::HandleScope scope(v8::Isolate::GetCurrent());
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   RegExpNode* node = Compile(input, multiline, is_ascii);
   USE(node);
 #ifdef DEBUG
@@ -571,7 +571,7 @@ static unsigned PseudoRandom(int i, int j) {
 TEST(SplayTreeSimple) {
   v8::internal::V8::Initialize(NULL);
   static const unsigned kLimit = 1000;
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   ZoneSplayTree<TestConfig> tree(Isolate::Current()->runtime_zone());
   bool seen[kLimit];
   for (unsigned i = 0; i < kLimit; i++) seen[i] = false;
@@ -639,7 +639,7 @@ TEST(DispatchTableConstruction) {
     }
   }
   // Enter test data into dispatch table.
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   DispatchTable table(Isolate::Current()->runtime_zone());
   for (int i = 0; i < kRangeCount; i++) {
     uc16* range = ranges[i];
@@ -709,7 +709,7 @@ class ContextInitializer {
   ContextInitializer()
       : scope_(v8::Isolate::GetCurrent()),
         env_(v8::Context::New(v8::Isolate::GetCurrent())),
-        zone_(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT) {
+        zone_(Isolate::Current()->runtime_zone()) {
     env_->Enter();
   }
   ~ContextInitializer() {
@@ -1428,7 +1428,7 @@ TEST(AddInverseToTable) {
   static const int kLimit = 1000;
   static const int kRangeCount = 16;
   for (int t = 0; t < 10; t++) {
-    ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+    ZoneScope zone_scope(Isolate::Current()->runtime_zone());
     Zone* zone = Isolate::Current()->runtime_zone();
     ZoneList<CharacterRange>* ranges =
         new(zone)
@@ -1452,7 +1452,7 @@ TEST(AddInverseToTable) {
       CHECK_EQ(is_on, set->Get(0) == false);
     }
   }
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
   ZoneList<CharacterRange>* ranges =
       new(zone) ZoneList<CharacterRange>(1, zone);
@@ -1567,7 +1567,7 @@ TEST(UncanonicalizeEquivalence) {
 
 static void TestRangeCaseIndependence(CharacterRange input,
                                       Vector<CharacterRange> expected) {
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
   int count = expected.length();
   ZoneList<CharacterRange>* list =
@@ -1633,7 +1633,7 @@ static bool InClass(uc16 c, ZoneList<CharacterRange>* ranges) {
 
 TEST(CharClassDifference) {
   v8::internal::V8::Initialize(NULL);
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
   ZoneList<CharacterRange>* base =
       new(zone) ZoneList<CharacterRange>(1, zone);
@@ -1663,7 +1663,7 @@ TEST(CharClassDifference) {
 
 TEST(CanonicalizeCharacterSets) {
   v8::internal::V8::Initialize(NULL);
-  ZoneScope scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope scope(Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
   ZoneList<CharacterRange>* list =
       new(zone) ZoneList<CharacterRange>(4, zone);
@@ -1726,7 +1726,7 @@ TEST(CanonicalizeCharacterSets) {
 
 TEST(CharacterRangeMerge) {
   v8::internal::V8::Initialize(NULL);
-  ZoneScope zone_scope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(Isolate::Current()->runtime_zone());
   ZoneList<CharacterRange> l1(4, Isolate::Current()->runtime_zone());
   ZoneList<CharacterRange> l2(4, Isolate::Current()->runtime_zone());
   Zone* zone = Isolate::Current()->runtime_zone();
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index 12d71e9144..29fb80fc37 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -570,7 +570,7 @@ TEST(Traverse) {
   printf("TestTraverse\n");
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
-  ZoneScope zone(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone(Isolate::Current()->runtime_zone());
   ConsStringGenerationData data(false);
   Handle<String> flat = ConstructBalanced(&data);
   FlattenString(flat);
@@ -660,7 +660,7 @@ void TestStringCharacterStream(BuildString build, int test_cases) {
   CcTest::InitializeVM();
   Isolate* isolate = Isolate::Current();
   HandleScope outer_scope(isolate);
-  ZoneScope zone(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone(Isolate::Current()->runtime_zone());
   ConsStringGenerationData data(true);
   for (int i = 0; i < test_cases; i++) {
     printf("%d\n", i);
@@ -929,7 +929,7 @@ TEST(Utf8Conversion) {
 
 
 TEST(ExternalShortStringAdd) {
-  ZoneScope zonescope(Isolate::Current()->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zonescope(Isolate::Current()->runtime_zone());
 
   CcTest::InitializeVM();
   v8::HandleScope handle_scope(CcTest::isolate());
@@ -1021,7 +1021,7 @@ TEST(CachedHashOverflow) {
   // values didn't fit in the hash field.
   // See http://code.google.com/p/v8/issues/detail?id=728
   Isolate* isolate = Isolate::Current();
-  ZoneScope zone(isolate->runtime_zone(), DELETE_ON_EXIT);
+  ZoneScope zone(isolate->runtime_zone());
 
   CcTest::InitializeVM();
   v8::HandleScope handle_scope(CcTest::isolate());