Oilpan: Remove support for tracing off-heap HashSets.

Source/modules/webaudio/AudioNodeOutput.cpp

 /*
  * Copyright (C) 2010, 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 37 matching lines @@
     m_internalBus = AudioBus::create(numberOfChannels, AudioNode::ProcessingSizeInFrames);
 }
 
 PassOwnPtrWillBeRawPtr<AudioNodeOutput> AudioNodeOutput::create(AudioNode* node, unsigned numberOfChannels)
 {
     return adoptPtrWillBeNoop(new AudioNodeOutput(node, numberOfChannels));
 }
 
 void AudioNodeOutput::trace(Visitor* visitor)
 {
+#if ENABLE(OILPAN)
     visitor->trace(m_node);
     visitor->trace(m_inputs);
     visitor->trace(m_params);
+#endif
 }
 
 void AudioNodeOutput::setNumberOfChannels(unsigned numberOfChannels)
 {
     ASSERT(numberOfChannels <= AudioContext::maxNumberOfChannels());
     ASSERT(context()->isGraphOwner());
 
     m_desiredNumberOfChannels = numberOfChannels;
 
     if (context()->isAudioThread()) {
@@ skipping 152 matching lines @@
     if (!m_isEnabled) {
         for (InputsIterator i = m_inputs.begin(); i != m_inputs.end(); ++i)
             i->key->enable(*this);
         m_isEnabled = true;
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)