Make IDL Callbacks non-refcounted by default

Source/modules/quota/StorageErrorCallback.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "config.h"
 
 #include "modules/quota/StorageErrorCallback.h"
 
 #include "core/dom/DOMError.h"
 
 namespace WebCore {
 
-StorageErrorCallback::CallbackTask::CallbackTask(PassRefPtr<StorageErrorCallback> callback, ExceptionCode ec)
+StorageErrorCallback::CallbackTask::CallbackTask(PassOwnPtr<StorageErrorCallback> callback, ExceptionCode ec)
     : m_callback(callback)
     , m_ec(ec)
 {
 }
 
 void StorageErrorCallback::CallbackTask::performTask(ExecutionContext*)
 {
     if (!m_callback)
         return;
     m_callback->handleEvent(DOMError::create(m_ec).get());
 }
 
 } // namespace WebCore