Revert 168169 "Fix use-after-free of m_currentSpeechUtterance."

trunk/Source/modules/speech/SpeechSynthesis.cpp

 /*
  * Copyright (C) 2013 Apple 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 204 matching lines @@
     if (utterance->client())
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), false);
 }
 
 void SpeechSynthesis::speakingErrorOccurred(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
 {
     if (utterance->client())
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), true);
 }
 
-SpeechSynthesisUtterance* SpeechSynthesis::currentSpeechUtterance() const
-{
-    if (!m_utteranceQueue.isEmpty())
-        return m_utteranceQueue.first().get();
-    return 0;
-}
-
 const AtomicString& SpeechSynthesis::interfaceName() const
 {
     return EventTargetNames::SpeechSynthesisUtterance;
 }
 
 void SpeechSynthesis::trace(Visitor* visitor)
 {
     visitor->trace(m_voiceList);
     visitor->trace(m_currentSpeechUtterance);
     visitor->trace(m_utteranceQueue);
 }
 
 } // namespace WebCore