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

Source/modules/speech/SpeechSynthesis.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
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  * modification, are permitted provided that the following conditions
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  *
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 #include "config.h"
 #include "modules/speech/SpeechSynthesis.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include "core/platform/PlatformSpeechSynthesisVoice.h"
 #include "core/platform/PlatformSpeechSynthesizer.h"
 #include "modules/speech/SpeechSynthesisEvent.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
     
 PassRefPtr<SpeechSynthesis> SpeechSynthesis::create()
 {
@@ skipping 162 matching lines @@
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), false);
 }
     
 void SpeechSynthesis::speakingErrorOccurred(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
 {
     if (utterance->client())
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), true);
 }
 
 } // namespace WebCore
-
-#endif // ENABLE(INPUT_SPEECH)