Oilpan: Move LifecycleNotifier's hierarchy to Oilpan's heap

Source/core/dom/ExecutionContext.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2012 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
@@ skipping 144 matching lines @@
     class PendingException;
     OwnPtrWillBeMember<WillBeHeapVector<OwnPtrWillBeMember<PendingException> > > m_pendingExceptions;
 
     bool m_activeDOMObjectsAreSuspended;
     bool m_activeDOMObjectsAreStopped;
 
     OwnPtrWillBeMember<PublicURLManager> m_publicURLManager;
 
     bool m_strictMixedContentCheckingEnforced;
 
-    OwnPtr<ContextLifecycleNotifier> m_lifecycleNotifier;
-
     // Counter that keeps track of how many window interaction calls are allowed
     // for this ExecutionContext. Callers are expected to call
     // |allowWindowInteraction()| and |consumeWindowInteraction()| in order to
     // increment and decrement the counter.
     int m_windowInteractionTokens;
 };
 
 } // namespace blink
 
 #endif // ExecutionContext_h