Make DOMWindowProperty::frameDestroyed non-virtual

third_party/WebKit/Source/core/frame/DOMWindowProperty.h

 /*
  * Copyright (C) 2011 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 19 matching lines @@
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalFrame;
 
 class CORE_EXPORT DOMWindowProperty : public GarbageCollectedMixin {
  public:
   explicit DOMWindowProperty(LocalFrame*);
 
-  virtual void frameDestroyed();
+  void frameDestroyed();
 
   LocalFrame* frame() const { return m_frame; }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   Member<LocalFrame> m_frame;
 };
 
 }  // namespace blink
 
 #endif  // DOMWindowProperty_h