WebAudio: Fix AudioNode leak in a case that AudioNode is not disconnected from the graph explicitly.

Source/modules/webaudio/AudioSummingJunction.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 38 matching lines @@
     m_context->removeMarkedSummingJunction(this);
 }
 
 AudioSummingJunction::~AudioSummingJunction()
 {
 }
 
 DEFINE_TRACE(AudioSummingJunction)
 {
     visitor->trace(m_context);
-    // FIXME: Oilpan: m_renderingOutputs should not be strong references.  This
-    // is a short-term workaround to avoid crashes, and causes AudioNode leaks.
-    AudioContext::AutoLocker locker(m_context);
-    for (size_t i = 0; i < m_renderingOutputs.size(); ++i)
-        visitor->trace(m_renderingOutputs[i]);
 }
 
 void AudioSummingJunction::changedOutputs()
 {
     ASSERT(context()->isGraphOwner());
     if (!m_renderingStateNeedUpdating && !m_didCallDispose) {
         context()->markSummingJunctionDirty(this);
         m_renderingStateNeedUpdating = true;
     }
 }
@@ skipping 13 matching lines @@
 
         didUpdate();
 
         m_renderingStateNeedUpdating = false;
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)