Make IDL Callbacks non-refcounted by default

Source/modules/mediastream/RTCStatsRequestImpl.h

 /*
  * Copyright (C) 2012 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 21 matching lines @@
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class MediaStreamTrack;
 class RTCStatsCallback;
 
 class RTCStatsRequestImpl : public RTCStatsRequest, public ActiveDOMObject {
 public:
-    static PassRefPtr<RTCStatsRequestImpl> create(ExecutionContext*, PassRefPtr<RTCStatsCallback>, PassRefPtr<MediaStreamTrack>);
+    static PassRefPtr<RTCStatsRequestImpl> create(ExecutionContext*, PassOwnPtr<RTCStatsCallback>, PassRefPtr<MediaStreamTrack>);
     virtual ~RTCStatsRequestImpl();
 
     virtual PassRefPtr<RTCStatsResponseBase> createResponse() OVERRIDE;
     virtual bool hasSelector() OVERRIDE;
     virtual MediaStreamComponent* component() OVERRIDE;
 
     virtual void requestSucceeded(PassRefPtr<RTCStatsResponseBase>) OVERRIDE;
 
     // ActiveDOMObject
     virtual void stop() OVERRIDE;
 
 private:
-    RTCStatsRequestImpl(ExecutionContext*, PassRefPtr<RTCStatsCallback>, PassRefPtr<MediaStreamTrack>);
+    RTCStatsRequestImpl(ExecutionContext*, PassOwnPtr<RTCStatsCallback>, PassRefPtr<MediaStreamTrack>);
 
     void clear();
 
-    RefPtr<RTCStatsCallback> m_successCallback;
+    OwnPtr<RTCStatsCallback> m_successCallback;
     RefPtr<MediaStreamComponent> m_component;
 };
 
 } // namespace WebCore
 
 #endif // RTCStatsRequestImpl_h