Reland: [Oilpan] Move MediaStream{Source|Component|Descriptor} to Oilpan heap

third_party/WebKit/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 45 matching lines @@
     return RTCStatsResponse::create();
 }
 
 bool RTCStatsRequestImpl::hasSelector()
 {
     return m_component;
 }
 
 MediaStreamComponent* RTCStatsRequestImpl::component()
 {
-    return m_component.get();
+    return m_component;
 }
 
 void RTCStatsRequestImpl::requestSucceeded(RTCStatsResponseBase* response)
 {
     bool shouldFireCallback = m_requester ? m_requester->shouldFireGetStatsCallback() : false;
     if (shouldFireCallback && m_successCallback)
         m_successCallback->handleEvent(static_cast<RTCStatsResponse*>(response));
     clear();
 }
 
 void RTCStatsRequestImpl::stop()
 {
     clear();
 }
 
 void RTCStatsRequestImpl::clear()
 {
     m_successCallback.clear();
     m_requester.clear();
 }
 
 DEFINE_TRACE(RTCStatsRequestImpl)
 {
     visitor->trace(m_successCallback);
+    visitor->trace(m_component);
     visitor->trace(m_requester);
     RTCStatsRequest::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink