Oilpan: Enable oilpan for callback classes

Source/modules/webaudio/AudioBufferCallback.h

 /*
  * Copyright (C) 2011, 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 AudioBufferCallback_h
 
 #if ENABLE(WEB_AUDIO)
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class AudioBuffer;
 
-class AudioBufferCallback : public NoBaseWillBeGarbageCollectedFinalized<AudioBufferCallback> {
+class AudioBufferCallback : public GarbageCollectedFinalized<AudioBufferCallback> {
 public:
     virtual ~AudioBufferCallback() { }
     virtual void trace(Visitor*) { }
     virtual void handleEvent(AudioBuffer*) = 0;
 };
 
 } // namespace
 
 #endif // ENABLE(WEB_AUDIO)
 
 #endif // AudioBufferCallback_h