Enable Oilpan by default for webaudio/

Source/modules/webaudio/ScriptProcessorNode.h

Index: Source/modules/webaudio/ScriptProcessorNode.h
diff --git a/Source/modules/webaudio/ScriptProcessorNode.h b/Source/modules/webaudio/ScriptProcessorNode.h
index 2a44ca61087c7430c178df1b7801ec6abcb17d81..77f5c4057d69bc278fc82803112cba02a2842763 100644
--- a/Source/modules/webaudio/ScriptProcessorNode.h
+++ b/Source/modules/webaudio/ScriptProcessorNode.h
@@ -50,7 +50,7 @@ public:
     // This value controls how frequently the onaudioprocess event handler is called and how many sample-frames need to be processed each call.
     // Lower numbers for bufferSize will result in a lower (better) latency. Higher numbers will be necessary to avoid audio breakup and glitches.
     // The value chosen must carefully balance between latency and audio quality.
-    static PassRefPtrWillBeRawPtr<ScriptProcessorNode> create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
+    static ScriptProcessorNode* create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
 
     virtual ~ScriptProcessorNode();
 
@@ -79,8 +79,8 @@ private:
     void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; }
     unsigned m_doubleBufferIndex;
     unsigned m_doubleBufferIndexForEvent;
-    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_inputBuffers;
-    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_outputBuffers;
+    HeapVector<Member<AudioBuffer> > m_inputBuffers;
+    HeapVector<Member<AudioBuffer> > m_outputBuffers;
 
     size_t m_bufferSize;
     unsigned m_bufferReadWriteIndex;