Revert of Oilpan: Move MediaStreamSource, MediaStreamComponent and MediaStreamDescriptor

Source/modules/webaudio/MediaStreamAudioDestinationNode.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 54 matching lines @@
 }
 
 void MediaStreamAudioDestinationNode::dispose()
 {
     uninitialize();
     AudioBasicInspectorNode::dispose();
 }
 
 void MediaStreamAudioDestinationNode::trace(Visitor* visitor)
 {
-    visitor->trace(m_source);
     visitor->trace(m_stream);
     AudioBasicInspectorNode::trace(visitor);
 }
 
 void MediaStreamAudioDestinationNode::process(size_t numberOfFrames)
 {
     m_mixBus->copyFrom(*input(0)->bus());
     m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)