Oilpan: Allocate all EventTarget derived types on the manged heap.

Source/modules/mediasource/MediaSourceBase.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 namespace blink {
 class WebSourceBuffer;
 }
 
 namespace WebCore {
 
 class ExceptionState;
 class GenericEventQueue;
 
 class MediaSourceBase : public RefCountedWillBeRefCountedGarbageCollected<MediaSourceBase>, public HTMLMediaSource, public ActiveDOMObject, public EventTargetWithInlineData {
-    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<MediaSourceBase>);
+    REFCOUNTED_EVENT_TARGET(MediaSourceBase);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaSourceBase);
 public:
     static const AtomicString& openKeyword();
     static const AtomicString& closedKeyword();
     static const AtomicString& endedKeyword();
 
     virtual ~MediaSourceBase();
 
     void addedToRegistry();
     void removedFromRegistry();
     void openIfInEndedState();
@@ skipping 18 matching lines @@
     // ActiveDOMObject interface
     virtual bool hasPendingActivity() const OVERRIDE FINAL;
     virtual void stop() OVERRIDE FINAL;
 
     // EventTarget interface
     virtual ExecutionContext* executionContext() const OVERRIDE FINAL;
 
     // URLRegistrable interface
     virtual URLRegistry& registry() const OVERRIDE FINAL;
 
-    virtual void trace(Visitor*) { }
-
 protected:
     explicit MediaSourceBase(ExecutionContext*);
 
     virtual void onReadyStateChange(const AtomicString& oldState, const AtomicString& newState) = 0;
     virtual Vector<RefPtr<TimeRanges> > activeRanges() const = 0;
     virtual bool isUpdating() const = 0;
 
     PassOwnPtr<blink::WebSourceBuffer> createWebSourceBuffer(const String& type, const Vector<String>& codecs, ExceptionState&);
     void scheduleEvent(const AtomicString& eventName);
     GenericEventQueue* asyncEventQueue() const { return m_asyncEventQueue.get(); }
 
 private:
     void endOfStreamInternal(const blink::WebMediaSource::EndOfStreamStatus, ExceptionState&);
     OwnPtr<blink::WebMediaSource> m_webMediaSource;
     AtomicString m_readyState;
     OwnPtr<GenericEventQueue> m_asyncEventQueue;
     // FIXME: oilpan: This should become a Member. For now, m_attachedElement will be cleared by the HTMLMediaElement destructor.
     HTMLMediaElement* m_attachedElement;
 };
 
 }
 
 #endif