Avoid snapshotting ContextLifecycleObservers when iterating.

third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp

 /*
  * Copyright (C) 2013 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 
 #include "core/page/PageLifecycleNotifier.h"
 
 #include "core/page/PageLifecycleObserver.h"
 
 namespace blink {
 
 void PageLifecycleNotifier::notifyPageVisibilityChanged()
 {
-    TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
+    TemporaryChange<IterationState> scope(m_iterationState, AllowingNone);
     for (PageLifecycleObserver* observer : m_observers)
         observer->pageVisibilityChanged();
 }
 
 void PageLifecycleNotifier::notifyDidCommitLoad(LocalFrame* frame)
 {
-    TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
+    TemporaryChange<IterationState> scope(m_iterationState, AllowingNone);
     for (PageLifecycleObserver* observer : m_observers)
         observer->didCommitLoad(frame);
 }
 
 } // namespace blink