Oilpan: turn DOMWindow into a heap supplementable.

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 "heap/Handle.h"
 #include "modules/speech/SpeechSynthesis.h"
 #include "platform/Supplementable.h"
 
 namespace WebCore {
 
 class DOMWindow;
 
-class DOMWindowSpeechSynthesis FINAL : public Supplement<DOMWindow>, public DOMWindowProperty {
+class DOMWindowSpeechSynthesis FINAL : public NoBaseWillBeGarbageCollectedFinalized<DOMWindowSpeechSynthesis>, public WillBeHeapSupplement<DOMWindow>, public DOMWindowProperty {

[haraken, 2014/03/27 00:59:03]

Ditto.

[sof, 2014/03/27 07:25:51]

I think we need to consider changing DOMWindowProperty first before that's
doable.

+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowSpeechSynthesis);
 public:
     virtual ~DOMWindowSpeechSynthesis();
 
     static SpeechSynthesis* speechSynthesis(DOMWindow&);
     static DOMWindowSpeechSynthesis& from(DOMWindow&);
 
+    void trace(Visitor*);
+
 private:
     explicit DOMWindowSpeechSynthesis(DOMWindow&);
 
     SpeechSynthesis* speechSynthesis();
     static const char* supplementName();
 
-    RefPtrWillBePersistent<SpeechSynthesis> m_speechSynthesis;
+    RefPtrWillBeMember<SpeechSynthesis> m_speechSynthesis;
 };
 
 } // namespace WebCore
 
 #endif // DOMWindowSpeechSynthesis_h