Remove an unused enumeration value.

Review URL: http://codereview.chromium.org/366030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ast.h

@@ -952,11 +952,7 @@ class Slot: public Expression {
     // variable name in the context object on the heap,
     // with lookup starting at the current context. index()
     // is invalid.
-    LOOKUP,
-
-    // A property in the global object. var()->name() is
-    // the property name.
-    GLOBAL
+    LOOKUP
   };
 
   Slot(Variable* var, Type type, int index)

src/prettyprinter.cc

@@ -1339,9 +1339,6 @@ void JsonAstBuilder::VisitSlot(Slot* expr) {
       case Slot::LOOKUP:
         AddAttribute("type", "LOOKUP");
         break;
-      case Slot::GLOBAL:
-        AddAttribute("type", "GLOBAL");
-        break;
     }
     AddAttribute("index", expr->index());
   }

src/scopeinfo.cc

@@ -100,8 +100,7 @@ ScopeInfo<Allocator>::ScopeInfo(Scope* scope)
             break;
 
           case Slot::LOOKUP:
-          case Slot::GLOBAL:
-            // these are currently not used
+            // This is currently not used.
             UNREACHABLE();
             break;
         }