Revert of Oilpan: Move MediaStreamSource, MediaStreamComponent and MediaStreamDescriptor

Source/modules/mediastream/RTCStatsRequestImpl.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:
  * 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 70 matching lines @@
 
 void RTCStatsRequestImpl::clear()
 {
     m_successCallback.clear();
     m_requester.clear();
 }
 
 void RTCStatsRequestImpl::trace(Visitor* visitor)
 {
     visitor->trace(m_successCallback);
-    visitor->trace(m_component);
     visitor->trace(m_requester);
     RTCStatsRequest::trace(visitor);
 }
 
 } // namespace blink