Make IDL Callbacks non-refcounted by default

Source/modules/webaudio/AudioContext.h

 /*
  * Copyright (C) 2010, 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 95 matching lines @@
     float sampleRate() const { return m_destinationNode->sampleRate(); }
     unsigned long activeSourceCount() const { return static_cast<unsigned long>(m_activeSourceCount); }
 
     void incrementActiveSourceCount();
     void decrementActiveSourceCount();
 
     PassRefPtr<AudioBuffer> createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
     PassRefPtr<AudioBuffer> createBuffer(ArrayBuffer*, bool mixToMono, ExceptionState&);
 
     // Asynchronous audio file data decoding.
-    void decodeAudioData(ArrayBuffer*, PassRefPtr<AudioBufferCallback>, PassRefPtr<AudioBufferCallback>, ExceptionState&);
+    void decodeAudioData(ArrayBuffer*, PassOwnPtr<AudioBufferCallback>, PassOwnPtr<AudioBufferCallback>, ExceptionState&);
 
     AudioListener* listener() { return m_listener.get(); }
 
     // The AudioNode create methods are called on the main thread (from JavaScript).
     PassRefPtr<AudioBufferSourceNode> createBufferSource();
     PassRefPtr<MediaElementAudioSourceNode> createMediaElementSource(HTMLMediaElement*, ExceptionState&);
     PassRefPtr<MediaStreamAudioSourceNode> createMediaStreamSource(MediaStream*, ExceptionState&);
     PassRefPtr<MediaStreamAudioDestinationNode> createMediaStreamDestination();
     PassRefPtr<GainNode> createGain();
     PassRefPtr<BiquadFilterNode> createBiquadFilter();
@@ skipping 210 matching lines @@
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
 
     // Number of AudioBufferSourceNodes that are active (playing).
     int m_activeSourceCount;
 };
 
 } // WebCore
 
 #endif // AudioContext_h