Revert "Remove MediaStreamDescriptor and call/use WebMediaStream directly"

Source/core/platform/chromium/support/WebRTCStatsRequest.cpp

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 52 matching lines @@
     return WebRTCStatsResponse(m_private->createResponse());
 }
 
 bool WebRTCStatsRequest::hasSelector() const
 {
     return m_private->hasSelector();
 }
 
 const WebMediaStream WebRTCStatsRequest::stream() const
 {
-    return m_private->stream();
+    return WebMediaStream(m_private->stream());
 }
 
 const WebMediaStreamTrack WebRTCStatsRequest::component() const
 {
     return WebMediaStreamTrack(m_private->component());
 }
 
 void WebRTCStatsRequest::requestSucceeded(const WebRTCStatsResponse& response) const
 {
     m_private->requestSucceeded(response);
 }
 
 } // namespace WebKit