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

Source/modules/mediastream/MediaStreamTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. 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 206 matching lines @@
 }
 
 ExecutionContext* MediaStreamTrack::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 void MediaStreamTrack::trace(Visitor* visitor)
 {
     visitor->trace(m_registeredMediaStreams);
+    EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace WebCore