Remove unused include of RetainPtr.h from PlatformSpeechSynthesizer.cpp.

Source/platform/speech/PlatformSpeechSynthesizer.cpp

 /*
  * Copyright (C) 2013 Apple Computer, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #include "config.h"
 #include "platform/speech/PlatformSpeechSynthesizer.h"
 
 #include "platform/exported/WebSpeechSynthesizerClientImpl.h"
 #include "platform/speech/PlatformSpeechSynthesisUtterance.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebSpeechSynthesisUtterance.h"
 #include "public/platform/WebSpeechSynthesizer.h"
 #include "public/platform/WebSpeechSynthesizerClient.h"
-#include "wtf/RetainPtr.h"
 
 namespace blink {
 
 PlatformSpeechSynthesizer* PlatformSpeechSynthesizer::create(PlatformSpeechSynthesizerClient* client)
 {
     PlatformSpeechSynthesizer* synthesizer = new PlatformSpeechSynthesizer(client);
     synthesizer->initializeVoiceList();
     return synthesizer;
 }
 
@@ skipping 44 matching lines @@
 }
 
 DEFINE_TRACE(PlatformSpeechSynthesizer)
 {
     visitor->trace(m_speechSynthesizerClient);
     visitor->trace(m_voiceList);
     visitor->trace(m_webSpeechSynthesizerClient);
 }
 
 } // namespace blink