[WIP]Issue FrameDestructionObserver::frameDestroyed() notification on detach.

Source/core/frame/LocalDOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 218 matching lines @@
     public:
         static PassOwnPtrWillBeRawPtr<WindowFrameObserver> create(LocalDOMWindow*, LocalFrame&);
 
         virtual void trace(Visitor*) override;
 
     private:
         WindowFrameObserver(LocalDOMWindow*, LocalFrame&);
 
         // FrameDestructionObserver overrides:
         void willDetachFrameHost() override;
+        void frameDestroyed() override;
 
         RawPtrWillBeMember<LocalDOMWindow> m_window;
     };
     friend WTF::OwnedPtrDeleter<WindowFrameObserver>;
 
     explicit LocalDOMWindow(LocalFrame&);
 
     Page* page();
 
     void clearDocument();
     void willDestroyDocumentInFrame();
 
     // FIXME: Oilpan: the need for this internal method will fall
     // away when EventTargets are no longer using refcounts and
     // window properties are also on the heap. Inline the minimal
     // do-not-broadcast handling then and remove the enum +
     // removeAllEventListenersInternal().
     enum BroadcastListenerRemoval {
         DoNotBroadcastListenerRemoval,
         DoBroadcastListenerRemoval
     };
 
     void willDetachFrameHost();
+    void frameDestroyed();
     void removeAllEventListenersInternal(BroadcastListenerRemoval);
 
     OwnPtrWillBeMember<WindowFrameObserver> m_frameObserver;
     RefPtrWillBeMember<Document> m_document;
 
     bool m_shouldPrintWhenFinishedLoading;
 #if ENABLE(ASSERT)
     bool m_hasBeenReset;
 #endif
 
@@ skipping 35 matching lines @@
 }
 
 inline String LocalDOMWindow::defaultStatus() const
 {
     return m_defaultStatus;
 }
 
 } // namespace blink
 
 #endif // LocalDOMWindow_h