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

Source/core/html/MediaController.h

 /*
  * Copyright (C) 2011 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 102 matching lines @@
     friend class HTMLMediaElement;
     friend class MediaControllerEventListener;
     Vector<HTMLMediaElement*> m_mediaElements;
     bool m_paused;
     double m_defaultPlaybackRate;
     double m_volume;
     mutable double m_position;
     bool m_muted;
     ReadyState m_readyState;
     PlaybackState m_playbackState;
-    Vector<RefPtr<Event> > m_pendingEvents;
+    WillBePersistentHeapVector<RefPtrWillBeMember<Event> > m_pendingEvents;
     Timer<MediaController> m_asyncEventTimer;
     mutable Timer<MediaController> m_clearPositionTimer;
     OwnPtr<Clock> m_clock;
     ExecutionContext* m_executionContext;
     Timer<MediaController> m_timeupdateTimer;
     double m_previousTimeupdateTime;
 };
 
 } // namespace WebCore
 
 #endif