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

Source/core/platform/mock/PlatformSpeechSynthesizerMock.h

 /*
  * Copyright (C) 2013 Apple Computer, Inc.  All rights reserved.
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 #ifndef PlatformSpeechSynthesizerMock_h
 #define PlatformSpeechSynthesizerMock_h
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include "core/platform/PlatformSpeechSynthesizer.h"
 #include "core/platform/Timer.h"
 #include <wtf/PassOwnPtr.h>
 
 namespace WebCore {
     
 class PlatformSpeechSynthesizerMock : public PlatformSpeechSynthesizer {
 public:
     static PassOwnPtr<PlatformSpeechSynthesizerMock> create(PlatformSpeechSynthesizerClient*);
     
     virtual ~PlatformSpeechSynthesizerMock();
     virtual void speak(PassRefPtr<PlatformSpeechSynthesisUtterance>);
     virtual void pause();
     virtual void resume();
     virtual void cancel();
     
 private:
     explicit PlatformSpeechSynthesizerMock(PlatformSpeechSynthesizerClient*);
     virtual void initializeVoiceList();
     void speakingFinished(Timer<PlatformSpeechSynthesizerMock>*);
     
     Timer<PlatformSpeechSynthesizerMock> m_speakingFinishedTimer;
     RefPtr<PlatformSpeechSynthesisUtterance> m_utterance;
 };
     
 } // namespace WebCore
 
-#endif // ENABLE(SPEECH_SYNTHESIS)
-
 #endif // PlatformSpeechSynthesizer_h