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

Source/modules/encryptedmedia/MediaKeySession.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 48 matching lines @@
 // WeakPtr<MediaKeys> is used instead of having MediaKeys and MediaKeySession
 // keep references to each other, and then having to inform the other object
 // when it gets destroyed.
 //
 // Because this object controls the lifetime of the WebContentDecryptionModuleSession,
 // it may outlive any JavaScript references as long as the MediaKeys object is alive.
 // The WebContentDecryptionModuleSession has the same lifetime as this object.
 class MediaKeySession FINAL
     : public RefCountedWillBeRefCountedGarbageCollected<MediaKeySession>, public ActiveDOMObject, public ScriptWrappable, public EventTargetWithInlineData
     , private blink::WebContentDecryptionModuleSession::Client {
-    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<MediaKeySession>);
+    REFCOUNTED_EVENT_TARGET(MediaKeySession);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaKeySession);
 public:
     static PassRefPtrWillBeRawPtr<MediaKeySession> create(ExecutionContext*, blink::WebContentDecryptionModule*, WeakPtrWillBeRawPtr<MediaKeys>);
     virtual ~MediaKeySession();
 
     const String& keySystem() const { return m_keySystem; }
     String sessionId() const;
 
     void setError(MediaKeyError*);
     MediaKeyError* error() { return m_error.get(); }
 
     void initializeNewSession(const String& mimeType, const Uint8Array& initData);
     void update(Uint8Array* response, ExceptionState&);
     void release(ExceptionState&);
 
     void enqueueEvent(PassRefPtrWillBeRawPtr<Event>);
 
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
     // ActiveDOMObject
     virtual bool hasPendingActivity() const OVERRIDE;
     virtual void stop() OVERRIDE;
 
-    void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
     // A struct holding the pending action.
     struct PendingAction {
         enum Type {
             Update,
             Release
         };
         const Type type;
         const RefPtr<Uint8Array> data;
@@ skipping 26 matching lines @@
     // Is the CDM finished with this session?
     bool m_isClosed;
 
     Deque<OwnPtr<PendingAction> > m_pendingActions;
     Timer<MediaKeySession> m_actionTimer;
 };
 
 }
 
 #endif // MediaKeySession_h