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

Source/core/platform/chromium/support/WebSpeechSynthesisVoice.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #include "config.h"
 #include <public/WebSpeechSynthesisVoice.h>
 
 #include "modules/speech/SpeechRecognitionAlternative.h"
 #include "modules/speech/SpeechSynthesisVoice.h"
 #include <wtf/PassRefPtr.h>
 #include <wtf/Vector.h>
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 namespace WebKit {
 
 void WebSpeechSynthesisVoice::assign(const WebSpeechSynthesisVoice& other)
 {
     m_private = other.m_private;
 }
 
 void WebSpeechSynthesisVoice::reset()
 {
     m_private.reset();
@@ skipping 23 matching lines @@
 {
     m_private->setIsDefault(isDefault);
 }
 
 WebSpeechSynthesisVoice::operator PassRefPtr<WebCore::PlatformSpeechSynthesisVoice>() const
 {
     return m_private.get();
 }
 
 } // namespace WebKit
-
-#endif // ENABLE(SPEECH_SYNTHESIS)