Clean up WebDOMEvent ownership of WebCore::Event.

Source/WebKit/chromium/src/WebDOMCustomEvent.cpp

 /*
  * 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:
  *
  *     * 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 24 matching lines @@
 #include "bindings/v8/SerializedScriptValue.h"
 #include "core/dom/CustomEvent.h"
 #include <public/WebString.h>
 
 using namespace WebCore;
 
 namespace WebKit {
 
 void WebDOMCustomEvent::initCustomEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& webSerializedScriptValue)
 {
-    ASSERT(m_private);
+    ASSERT(m_private.get());
     RefPtr<SerializedScriptValue> serializedScriptValue;
     serializedScriptValue = webSerializedScriptValue;
     unwrap<CustomEvent>()->initCustomEvent(type, canBubble, cancelable, serializedScriptValue.get());
 }
 
 } // namespace WebKit