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

Source/core/platform/mock/PlatformSpeechSynthesizerMock.cpp

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 #include "config.h"
 #include "core/platform/PlatformSpeechSynthesisUtterance.h"
 #include "core/platform/mock/PlatformSpeechSynthesizerMock.h"
 
-#if ENABLE(SPEECH_SYNTHESIS)
-
 namespace WebCore {
 
 PassOwnPtr<PlatformSpeechSynthesizerMock> PlatformSpeechSynthesizerMock::create(PlatformSpeechSynthesizerClient* client)
 {
     OwnPtr<PlatformSpeechSynthesizerMock> synthesizer = adoptPtr(new PlatformSpeechSynthesizerMock(client));
     synthesizer->initializeVoiceList();
     return synthesizer.release();
 }
     
 PlatformSpeechSynthesizerMock::PlatformSpeechSynthesizerMock(PlatformSpeechSynthesizerClient* client)
@@ skipping 51 matching lines @@
     client()->didPauseSpeaking(m_utterance);
 }
 
 void PlatformSpeechSynthesizerMock::resume()
 {
     client()->didResumeSpeaking(m_utterance);
 }
 
     
 } // namespace WebCore
-
-#endif // ENABLE(SPEECH_SYNTHESIS)