Make IDL Callbacks non-refcounted by default

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 101 matching lines @@
     case MediaStreamSource::ReadyStateMuted:
         return "muted";
     case MediaStreamSource::ReadyStateEnded:
         return "ended";
     }
 
     ASSERT_NOT_REACHED();
     return String();
 }
 
-void MediaStreamTrack::getSources(ExecutionContext* context, PassRefPtr<MediaStreamTrackSourcesCallback> callback, ExceptionState& exceptionState)
+void MediaStreamTrack::getSources(ExecutionContext* context, PassOwnPtr<MediaStreamTrackSourcesCallback> callback, ExceptionState& exceptionState)
 {
     RefPtr<MediaStreamTrackSourcesRequest> request = MediaStreamTrackSourcesRequest::create(context->securityOrigin()->toString(), callback);
     MediaStreamCenter::instance().getMediaStreamTrackSources(request.release());
 }
 
 void MediaStreamTrack::stopTrack(ExceptionState& exceptionState)
 {
     if (ended())
         return;
 
@@ skipping 69 matching lines @@
 {
     return EventTargetNames::MediaStreamTrack;
 }
 
 ExecutionContext* MediaStreamTrack::executionContext() const
 {
     return ActiveDOMObject::executionContext();
 }
 
 } // namespace WebCore