Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/modules/mediastream/RTCDTMFSender.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:
  * 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 53 matching lines @@
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
     // ActiveDOMObject
     virtual void stop() OVERRIDE;
 
 private:
     RTCDTMFSender(ExecutionContext*, PassRefPtr<MediaStreamTrack>, PassOwnPtr<blink::WebRTCDTMFSenderHandler>);
 
-    void scheduleDispatchEvent(PassRefPtr<Event>);
+    void scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event>);
     void scheduledEventTimerFired(Timer<RTCDTMFSender>*);
 
     // blink::WebRTCDTMFSenderHandlerClient
     virtual void didPlayTone(const blink::WebString&) OVERRIDE;
 
     RefPtr<MediaStreamTrack> m_track;
     long m_duration;
     long m_interToneGap;
 
     OwnPtr<blink::WebRTCDTMFSenderHandler> m_handler;
 
     bool m_stopped;
 
     Timer<RTCDTMFSender> m_scheduledEventTimer;
-    Vector<RefPtr<Event> > m_scheduledEvents;
+    WillBePersistentHeapVector<RefPtrWillBeMember<Event> > m_scheduledEvents;
 };
 
 } // namespace WebCore
 
 #endif // RTCDTMFSender_h