Oilpan: turn DOMWindow into a heap supplementable.

Source/modules/speech/DOMWindowSpeechSynthesis.h

Index: Source/modules/speech/DOMWindowSpeechSynthesis.h
diff --git a/Source/modules/speech/DOMWindowSpeechSynthesis.h b/Source/modules/speech/DOMWindowSpeechSynthesis.h
index e78a4e19cb0e4610c0bdcd6b06d8e8b74eb55649..22b7bfc17bcb62cb73521f28dc32381c4de8cd24 100644
--- a/Source/modules/speech/DOMWindowSpeechSynthesis.h
+++ b/Source/modules/speech/DOMWindowSpeechSynthesis.h
@@ -35,20 +35,23 @@ 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