Tried to move AudioSummingJuction to oilpan

Source/modules/webaudio/OfflineAudioContext.h

 /*
  * Copyright (C) 2012, 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 15 matching lines @@
 #define OfflineAudioContext_h
 
 #include "modules/webaudio/AudioContext.h"
 
 namespace WebCore {
 
 class ExceptionState;
 
 class OfflineAudioContext FINAL : public AudioContext {
 public:
-    static PassRefPtr<OfflineAudioContext> create(ExecutionContext*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
+    static PassRefPtrWillBeRawPtr<OfflineAudioContext> create(ExecutionContext*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
 
     virtual ~OfflineAudioContext();
 
 private:
     OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
 };
 
 } // namespace WebCore
 
 #endif // OfflineAudioContext_h