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

Source/core/platform/PlatformSpeechSynthesisVoice.cpp

 /*
  * Copyright (C) 2013 Apple Computer, Inc.  All rights reserved.
  *
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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
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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 #include "config.h"
 #include "core/platform/PlatformSpeechSynthesisVoice.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 namespace WebCore {
 
 PassRefPtr<PlatformSpeechSynthesisVoice> PlatformSpeechSynthesisVoice::create(const String& voiceURI, const String& name, const String& lang, bool localService, bool isDefault)
 {
     return adoptRef(new PlatformSpeechSynthesisVoice(voiceURI, name, lang, localService, isDefault));
 }
 
 PassRefPtr<PlatformSpeechSynthesisVoice> PlatformSpeechSynthesisVoice::create()
 {
     return adoptRef(new PlatformSpeechSynthesisVoice());
 }
     
 PlatformSpeechSynthesisVoice::PlatformSpeechSynthesisVoice(const String& voiceURI, const String& name, const String& lang, bool localService, bool isDefault)
     : m_voiceURI(voiceURI)
     , m_name(name)
     , m_lang(lang)
     , m_localService(localService)
     , m_default(isDefault)
 {
 }
 
 PlatformSpeechSynthesisVoice::PlatformSpeechSynthesisVoice()
     : m_localService(false)
     , m_default(false)
 {
 }
 
 } // namespace WebCore
-
-#endif // ENABLE(SPEECH_SYNTHESIS)