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

Source/core/platform/PlatformSpeechSynthesisVoice.h

 /*
  * Copyright (C) 2013 Apple Computer, 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
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  * 2. Redistributions in binary form must reproduce the above copyright
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  *
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 #ifndef PlatformSpeechSynthesisVoice_h
 #define PlatformSpeechSynthesisVoice_h
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class PlatformSpeechSynthesisVoice : public RefCounted<PlatformSpeechSynthesisVoice> {
 public:
     static PassRefPtr<PlatformSpeechSynthesisVoice> create(const String& voiceURI, const String& name, const String& lang, bool localService, bool isDefault);
     static PassRefPtr<PlatformSpeechSynthesisVoice> create();
@@ skipping 19 matching lines @@
 
     String m_voiceURI;
     String m_name;
     String m_lang;
     bool m_localService;
     bool m_default;
 };
 
 } // namespace WebCore
 
-#endif // ENABLE(SPEECH_SYNTHESIS)
-
 #endif // PlatformSpeechSynthesisVoice_h