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

Source/core/platform/PlatformSpeechSynthesizer.cpp

 /*
  * Copyright (C) 2013 Apple Computer, Inc.  All rights reserved.
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 #include "config.h"
 #include "core/platform/PlatformSpeechSynthesizer.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 namespace WebCore {
     
 PassOwnPtr<PlatformSpeechSynthesizer> PlatformSpeechSynthesizer::create(PlatformSpeechSynthesizerClient* client)
 {
     OwnPtr<PlatformSpeechSynthesizer> synthesizer = adoptPtr(new PlatformSpeechSynthesizer(client));
     synthesizer->initializeVoiceList();
     return synthesizer.release();
 }
 
 void PlatformSpeechSynthesizer::setVoiceList(Vector<RefPtr<PlatformSpeechSynthesisVoice> >& voices)
 {
     m_voiceList = voices;
 }
 
 
 } // namespace WebCore
-
-#endif // ENABLE(SPEECH_SYNTHESIS)