Make use of ContextClient in modules/speech/

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

Index: third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp
diff --git a/third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp b/third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp
index 68a83394c177ef1040d35334e8b3ffc56733ebd4..f7c3d31d420e52822d1dc240254128bc72c0e38e 100644
--- a/third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp
+++ b/third_party/WebKit/Source/modules/speech/SpeechSynthesisUtterance.cpp
@@ -37,17 +37,13 @@ SpeechSynthesisUtterance* SpeechSynthesisUtterance::create(
 
 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;
 }
@@ -67,9 +63,9 @@ void SpeechSynthesisUtterance::setVoice(SpeechSynthesisVoice* voice) {
 }
 
 DEFINE_TRACE(SpeechSynthesisUtterance) {
-  visitor->trace(m_executionContext);
   visitor->trace(m_platformUtterance);
   visitor->trace(m_voice);
+  ContextClient::trace(visitor);
   EventTargetWithInlineData::trace(visitor);
 }