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

Source/modules/webaudio/AudioBasicProcessorNode.h

Index: Source/modules/webaudio/AudioBasicProcessorNode.h
diff --git a/Source/modules/webaudio/AudioBasicProcessorNode.h b/Source/modules/webaudio/AudioBasicProcessorNode.h
index 69a36168eafd47279488e648d4f4b1311d461433..50c7cb31e3d2b2f7f358630bd0518a0debffd5cc 100644
--- a/Source/modules/webaudio/AudioBasicProcessorNode.h
+++ b/Source/modules/webaudio/AudioBasicProcessorNode.h
@@ -39,8 +39,11 @@ class AudioProcessor;
 class AudioBasicProcessorNode : public AudioNode {
 public:
     AudioBasicProcessorNode(AudioContext*, float sampleRate);
+    virtual ~AudioBasicProcessorNode();
+    virtual void trace(Visitor*) OVERRIDE;
 
     // AudioNode
+    virtual void dispose() OVERRIDE FINAL;
     virtual void process(size_t framesToProcess) OVERRIDE FINAL;
     virtual void pullInputs(size_t framesToProcess) OVERRIDE FINAL;
     virtual void initialize() OVERRIDE FINAL;
@@ -57,7 +60,7 @@ protected:
     virtual double latencyTime() const OVERRIDE FINAL;
 
     AudioProcessor* processor() { return m_processor.get(); }
-    OwnPtr<AudioProcessor> m_processor;
+    OwnPtrWillBeMember<AudioProcessor> m_processor;
 };
 
 } // namespace blink