Make IDL Callbacks non-refcounted by default

Source/modules/webaudio/AsyncAudioDecoder.cpp

Index: Source/modules/webaudio/AsyncAudioDecoder.cpp
diff --git a/Source/modules/webaudio/AsyncAudioDecoder.cpp b/Source/modules/webaudio/AsyncAudioDecoder.cpp
index 338056449f4c069cd9161740a17d1eaaa00787aa..f1ea34f4c71456fad2716838e7c95099aba78e67 100644
--- a/Source/modules/webaudio/AsyncAudioDecoder.cpp
+++ b/Source/modules/webaudio/AsyncAudioDecoder.cpp
@@ -47,7 +47,7 @@ AsyncAudioDecoder::~AsyncAudioDecoder()
 {
 }
 
-void AsyncAudioDecoder::decodeAsync(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback)
+void AsyncAudioDecoder::decodeAsync(ArrayBuffer* audioData, float sampleRate, PassOwnPtr<AudioBufferCallback> successCallback, PassOwnPtr<AudioBufferCallback> errorCallback)
 {
     ASSERT(isMainThread());
     ASSERT(audioData);
@@ -58,7 +58,7 @@ void AsyncAudioDecoder::decodeAsync(ArrayBuffer* audioData, float sampleRate, Pa
     RefPtr<ArrayBuffer> audioDataRef(audioData);
 
     // The leak references to successCallback and errorCallback are picked up on notifyComplete.
-    m_thread->postTask(new Task(WTF::bind(&AsyncAudioDecoder::decode, audioDataRef.release().leakRef(), sampleRate, successCallback.leakRef(), errorCallback.leakRef())));
+    m_thread->postTask(new Task(WTF::bind(&AsyncAudioDecoder::decode, audioDataRef.release().leakRef(), sampleRate, successCallback.leakPtr(), errorCallback.leakPtr())));
 }
 
 void AsyncAudioDecoder::decode(ArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback)
@@ -75,8 +75,8 @@ void AsyncAudioDecoder::notifyComplete(ArrayBuffer* audioData, AudioBufferCallba
 {
     // Adopt references, so everything gets correctly dereffed.
     RefPtr<ArrayBuffer> audioDataRef = adoptRef(audioData);
-    RefPtr<AudioBufferCallback> successCallbackRef = adoptRef(successCallback);
-    RefPtr<AudioBufferCallback> errorCallbackRef = adoptRef(errorCallback);
+    OwnPtr<AudioBufferCallback> successCallbackPtr = adoptPtr(successCallback);
+    OwnPtr<AudioBufferCallback> errorCallbackPtr = adoptPtr(errorCallback);
     RefPtr<AudioBuffer> audioBufferRef = adoptRef(audioBuffer);
 
     if (audioBuffer && successCallback)