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

Source/modules/speech/chromium/SpeechSynthesisChromium.cpp

 /*
  * Copyright (C) 2013 Google Inc.
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 #include "config.h"
 #include "modules/speech/SpeechSynthesis.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include "modules/speech/SpeechSynthesisUtterance.h"
 #include "modules/speech/SpeechSynthesisVoice.h"
 
 namespace WebCore {
     
 void SpeechSynthesis::initializeVoiceList()
 {
 }
 
 bool SpeechSynthesis::pending() const
@@ skipping 21 matching lines @@
 
 void SpeechSynthesis::pause()
 {
 }
 
 void SpeechSynthesis::resume()
 {
 }
 
 } // namespace WebCore
-
-#endif // ENABLE(SPEECH_SYNTHESIS)