Oilpan: WebAudio: Prepare to move AudioProcessor hierarchy to Oilpan heap.

Source/modules/webaudio/AudioBasicProcessorNode.h

 /*
  * 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 21 matching lines @@
 namespace blink {
 
 class AudioBus;
 class AudioNodeInput;
 class AudioProcessor;
 
 // AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels.
 class AudioBasicProcessorNode : public AudioNode {
 public:
     AudioBasicProcessorNode(AudioContext*, float sampleRate);
+    virtual void trace(Visitor*) OVERRIDE;
 
     // AudioNode
     virtual void process(size_t framesToProcess) OVERRIDE FINAL;
     virtual void pullInputs(size_t framesToProcess) OVERRIDE FINAL;
     virtual void initialize() OVERRIDE FINAL;
     virtual void uninitialize() OVERRIDE FINAL;
 
     // Called in the main thread when the number of channels for the input may have changed.
     virtual void checkNumberOfChannelsForInput(AudioNodeInput*) OVERRIDE FINAL;
 
     // Returns the number of channels for both the input and the output.
     unsigned numberOfChannels();
 
 protected:
     virtual double tailTime() const OVERRIDE FINAL;
     virtual double latencyTime() const OVERRIDE FINAL;
 
     AudioProcessor* processor() { return m_processor.get(); }
-    OwnPtr<AudioProcessor> m_processor;
+    OwnPtrWillBeMember<AudioProcessor> m_processor;
 };
 
 } // namespace blink
 
 #endif // AudioBasicProcessorNode_h