Simplify LifecycleNotifier and Observer.

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 15 matching lines @@
 
 #include "core/page/PageLifecycleNotifier.h"
 
 #include "core/page/PageLifecycleObserver.h"
 
 namespace blink {
 
 void PageLifecycleNotifier::notifyPageVisibilityChanged()
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-#if !ENABLE(OILPAN)
-    // Notifications perform unknown amounts of heap allocations,
-    // which might trigger (conservative) GCs. This will flush out
-    // dead observers, causing the _non-heap_ set be updated. Snapshot
-    // the observers and explicitly check if they're still alive before
-    // notifying.
-    Vector<RawPtr<PageLifecycleObserver>> snapshotOfObservers;
-    copyToVector(m_observers, snapshotOfObservers);
-    for (PageLifecycleObserver* observer : snapshotOfObservers) {
-        if (m_observers.contains(observer))
-            observer->pageVisibilityChanged();
-    }
-#else
     for (PageLifecycleObserver* observer : m_observers)
         observer->pageVisibilityChanged();
-#endif
 }
 
 void PageLifecycleNotifier::notifyDidCommitLoad(LocalFrame* frame)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-#if !ENABLE(OILPAN)
-    // Notifications perform unknown amounts of heap allocations,
-    // which might trigger (conservative) GCs. This will flush out
-    // dead observers, causing the _non-heap_ set be updated. Snapshot
-    // the observers and explicitly check if they're still alive before
-    // notifying.
-    Vector<RawPtr<PageLifecycleObserver>> snapshotOfObservers;
-    copyToVector(m_observers, snapshotOfObservers);
-    for (PageLifecycleObserver* observer : snapshotOfObservers) {
-        if (m_observers.contains(observer))
-            observer->didCommitLoad(frame);
-    }
-#else
     for (PageLifecycleObserver* observer : m_observers)
         observer->didCommitLoad(frame);
-#endif
 }
 
 } // namespace blink