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

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 #include "config.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 #include <public/WebSpeechSynthesisUtterance.h>
 
 #include "core/platform/PlatformSpeechSynthesisUtterance.h"
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefPtr.h>
 
 using namespace WebCore;
 
 namespace WebKit {
 
@@ skipping 57 matching lines @@
 {
     return m_private->pitch();
 }
 
 double WebSpeechSynthesisUtterance::startTime() const
 {
     return m_private->startTime();
 }
 
 } // namespace WebKit
-
-#endif // ENABLE(SPEECH_SYNTHESIS)