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

Source/modules/webaudio/BiquadProcessor.h

Index: Source/modules/webaudio/BiquadProcessor.h
diff --git a/Source/modules/webaudio/BiquadProcessor.h b/Source/modules/webaudio/BiquadProcessor.h
index ae6bff551a1c18bebd3fecd23943368932c001ea..bb18f890430078d146c84dea453ee8bfda199d35 100644
--- a/Source/modules/webaudio/BiquadProcessor.h
+++ b/Source/modules/webaudio/BiquadProcessor.h
@@ -50,8 +50,8 @@ public:
     };
 
     BiquadProcessor(AudioContext*, float sampleRate, size_t numberOfChannels, bool autoInitialize);
-
     virtual ~BiquadProcessor();
+    virtual void trace(Visitor*) OVERRIDE;
 
     virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE;
 
@@ -80,10 +80,10 @@ public:
 private:
     FilterType m_type;
 
-    RefPtrWillBePersistent<AudioParam> m_parameter1;
-    RefPtrWillBePersistent<AudioParam> m_parameter2;
-    RefPtrWillBePersistent<AudioParam> m_parameter3;
-    RefPtrWillBePersistent<AudioParam> m_parameter4;
+    RefPtrWillBeMember<AudioParam> m_parameter1;
+    RefPtrWillBeMember<AudioParam> m_parameter2;
+    RefPtrWillBeMember<AudioParam> m_parameter3;
+    RefPtrWillBeMember<AudioParam> m_parameter4;
 
     // so DSP kernels know when to re-compute coefficients
     bool m_filterCoefficientsDirty;