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

Source/modules/speech/SpeechSynthesisUtterance.cpp

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 #include "config.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 namespace WebCore {
     
 PassRefPtr<SpeechSynthesisUtterance> SpeechSynthesisUtterance::create(ScriptExecutionContext* context, const String& text)
 {
     return adoptRef(new SpeechSynthesisUtterance(context, text));
 }
 
 SpeechSynthesisUtterance::SpeechSynthesisUtterance(ScriptExecutionContext* context, const String& text)
     : ContextDestructionObserver(context)
     , m_platformUtterance(PlatformSpeechSynthesisUtterance::create(this))
@@ skipping 25 matching lines @@
 {
     // Cache our own version of the SpeechSynthesisVoice so that we don't have to do some lookup
     // to go from the platform voice back to the speech synthesis voice in the read property.
     m_voice = voice;
     
     if (voice)
         m_platformUtterance->setVoice(voice->platformVoice());
 }
 
 } // namespace WebCore
-
-#endif // ENABLE(SPEECH_SYNTHESIS)