Oilpan: make DOMWindowProperty a GC mixin.

Source/modules/speech/DOMWindowSpeechSynthesis.h

 /*
  * Copyright (C) 2013 Apple 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 17 matching lines @@
 
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/speech/SpeechSynthesis.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalDOMWindow;
 
-class DOMWindowSpeechSynthesis FINAL : public NoBaseWillBeGarbageCollectedFinalized<DOMWindowSpeechSynthesis>, public WillBeHeapSupplement<LocalDOMWindow>, public DOMWindowProperty {
+class DOMWindowSpeechSynthesis FINAL : public NoBaseWillBeGarbageCollected<DOMWindowSpeechSynthesis>, public WillBeHeapSupplement<LocalDOMWindow>, public DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowSpeechSynthesis);
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowSpeechSynthesis);
 public:
-    virtual ~DOMWindowSpeechSynthesis();
-
     static SpeechSynthesis* speechSynthesis(LocalDOMWindow&);
     static DOMWindowSpeechSynthesis& from(LocalDOMWindow&);
 
     void trace(Visitor*);
 
 private:
     explicit DOMWindowSpeechSynthesis(LocalDOMWindow&);
 
     SpeechSynthesis* speechSynthesis();
     static const char* supplementName();
 
     PersistentWillBeMember<SpeechSynthesis> m_speechSynthesis;
 };
 
 } // namespace blink
 
 #endif // DOMWindowSpeechSynthesis_h