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

Source/core/html/track/TextTrack.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012, 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
@@ skipping 28 matching lines @@
 class ExceptionState;
 class HTMLMediaElement;
 class TextTrack;
 class TextTrackCue;
 class TextTrackCueList;
 class TextTrackList;
 class VTTRegion;
 class VTTRegionList;
 
 class TextTrack : public TrackBase, public ScriptWrappable, public EventTargetWithInlineData {
-    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<TrackBase>);
+    REFCOUNTED_EVENT_TARGET(TrackBase);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(TextTrack);
 public:
     static PassRefPtrWillBeRawPtr<TextTrack> create(Document& document, const AtomicString& kind, const AtomicString& label, const AtomicString& language)
     {
         return adoptRefWillBeRefCountedGarbageCollected(new TextTrack(document, kind, label, language, emptyAtom, AddTrack));
     }
     virtual ~TextTrack();
 
     virtual void setTrackList(TextTrackList*);
     TextTrackList* trackList() { return m_trackList; }
 
@@ skipping 77 matching lines @@
     TextTrackType m_trackType;
     ReadinessState m_readinessState;
     int m_trackIndex;
     int m_renderedTrackIndex;
     bool m_hasBeenConfigured;
 };
 
 } // namespace WebCore
 
 #endif