Switch speech synthesis from compile-flag to runtime-flag.

Source/modules/speech/SpeechSynthesis.h

 /*
  * 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
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  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 #ifndef SpeechSynthesis_h
 #define SpeechSynthesis_h
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include "core/platform/PlatformSpeechSynthesisUtterance.h"
 #include "core/platform/PlatformSpeechSynthesizer.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
 #include "modules/speech/SpeechSynthesisVoice.h"
 #include "wtf/Deque.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
@@ skipping 37 matching lines @@
     
     OwnPtr<PlatformSpeechSynthesizer> m_platformSpeechSynthesizer;
     Vector<RefPtr<SpeechSynthesisVoice> > m_voiceList;
     SpeechSynthesisUtterance* m_currentSpeechUtterance;
     Deque<RefPtr<SpeechSynthesisUtterance> > m_utteranceQueue;
     bool m_isPaused;
 };
     
 } // namespace WebCore
 
-#endif // ENABLE(SPEECH_SYNTHESIS)
-
 #endif // SpeechSynthesisEvent_h