Make use of ContextClient in modules/speech/

third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp

 /*
  * Copyright (C) 2013 Apple 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 19 matching lines @@
 namespace blink {
 
 SpeechSynthesisUtterance* SpeechSynthesisUtterance::create(
     ExecutionContext* context,
     const String& text) {
   return new SpeechSynthesisUtterance(context, text);
 }
 
 SpeechSynthesisUtterance::SpeechSynthesisUtterance(ExecutionContext* context,
                                                    const String& text)
-    : m_executionContext(context),
+    : ContextClient(context),
       m_platformUtterance(PlatformSpeechSynthesisUtterance::create(this)) {
   m_platformUtterance->setText(text);
 }
 
 SpeechSynthesisUtterance::~SpeechSynthesisUtterance() {}
 
-ExecutionContext* SpeechSynthesisUtterance::getExecutionContext() const {
-  return m_executionContext;
-}
-
 const AtomicString& SpeechSynthesisUtterance::interfaceName() const {
   return EventTargetNames::SpeechSynthesisUtterance;
 }
 
 SpeechSynthesisVoice* SpeechSynthesisUtterance::voice() const {
   return m_voice;
 }
 
 void SpeechSynthesisUtterance::setVoice(SpeechSynthesisVoice* voice) {
   // 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());
 }
 
 DEFINE_TRACE(SpeechSynthesisUtterance) {
-  visitor->trace(m_executionContext);
   visitor->trace(m_platformUtterance);
   visitor->trace(m_voice);
+  ContextClient::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink