diff --git a/include/v8.h b/include/v8.h
index 8cfeacdee0..c1e714a146 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4993,40 +4993,6 @@ class V8_EXPORT V8 {
   static void VisitHandlesForPartialDependence(
       Isolate* isolate, PersistentHandleVisitor* visitor);
 
-  /**
-   * Optional notification that the embedder is idle.
-   * V8 uses the notification to reduce memory footprint.
-   * This call can be used repeatedly if the embedder remains idle.
-   * Returns true if the embedder should stop calling IdleNotification
-   * until real work has been done.  This indicates that V8 has done
-   * as much cleanup as it will be able to do.
-   *
-   * The hint argument specifies the amount of work to be done in the function
-   * on scale from 1 to 1000. There is no guarantee that the actual work will
-   * match the hint.
-   *
-   * Deprecated, please use Isolate::IdleNotification.
-   */
-  static bool IdleNotification(int hint = 1000);
-
-  /**
-   * Optional notification that the system is running low on memory.
-   * V8 uses these notifications to attempt to free memory.
-   *
-   * Deprecated, please use Isolate::LowMemoryNotification.
-   */
-  static void LowMemoryNotification();
-
-  /**
-   * Optional notification that a context has been disposed. V8 uses
-   * these notifications to guide the GC heuristic. Returns the number
-   * of context disposals - including this one - since the last time
-   * V8 had a chance to clean up.
-   *
-   * Deprecated, please use Isolate::ContextDisposedNotification.
-   */
-  static int ContextDisposedNotification();
-
   /**
    * Initialize the ICU library bundled with V8. The embedder should only
    * invoke this method when using the bundled ICU. Returns true on success.
diff --git a/src/api.cc b/src/api.cc
index e473540d40..47ad1911f8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5078,34 +5078,6 @@ void v8::V8::VisitHandlesForPartialDependence(
 }
 
 
-bool v8::V8::IdleNotification(int hint) {
-  // Returning true tells the caller that it need not
-  // continue to call IdleNotification.
-  i::Isolate* isolate = i::Isolate::Current();
-  if (isolate == NULL || !isolate->IsInitialized()) return true;
-  if (!i::FLAG_use_idle_notification) return true;
-  return isolate->heap()->IdleNotification(hint);
-}
-
-
-void v8::V8::LowMemoryNotification() {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (isolate == NULL || !isolate->IsInitialized()) return;
-  {
-    i::HistogramTimerScope idle_notification_scope(
-        isolate->counters()->gc_low_memory_notification());
-    isolate->heap()->CollectAllAvailableGarbage("low memory notification");
-  }
-}
-
-
-int v8::V8::ContextDisposedNotification() {
-  i::Isolate* isolate = i::Isolate::Current();
-  if (!isolate->IsInitialized()) return 0;
-  return isolate->heap()->NotifyContextDisposed();
-}
-
-
 bool v8::V8::InitializeICU(const char* icu_data_file) {
   return i::InitializeICU(icu_data_file);
 }