Make IDL Callbacks non-refcounted by default

Source/modules/mediastream/MediaStreamTrack.h

 /*
  * 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 42 matching lines @@
     String id() const;
     String label() const;
 
     bool enabled() const;
     void setEnabled(bool);
 
     void didEndTrack();
 
     String readyState() const;
 
-    static void getSources(ExecutionContext*, PassRefPtr<MediaStreamTrackSourcesCallback>, ExceptionState&);
+    static void getSources(ExecutionContext*, PassOwnPtr<MediaStreamTrackSourcesCallback>, ExceptionState&);
     void stopTrack(ExceptionState&);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(mute);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(unmute);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(ended);
 
     MediaStreamComponent* component();
     bool ended() const;
 
     // EventTarget
@@ skipping 11 matching lines @@
 
     bool m_stopped;
     RefPtr<MediaStreamComponent> m_component;
 };
 
 typedef Vector<RefPtr<MediaStreamTrack> > MediaStreamTrackVector;
 
 } // namespace WebCore
 
 #endif // MediaStreamTrack_h