Remove ContextLifecycleObserver from SpeechSynthesis

third_party/WebKit/Source/modules/speech/SpeechSynthesis.h

Index: third_party/WebKit/Source/modules/speech/SpeechSynthesis.h
diff --git a/third_party/WebKit/Source/modules/speech/SpeechSynthesis.h b/third_party/WebKit/Source/modules/speech/SpeechSynthesis.h
index 3094a4cfc7174e3ffe21b29f7d228f4b0b47e216..6363225e31ce7b9817dc8f986f0042d052e95383 100644
--- a/third_party/WebKit/Source/modules/speech/SpeechSynthesis.h
+++ b/third_party/WebKit/Source/modules/speech/SpeechSynthesis.h
@@ -26,7 +26,6 @@
 #ifndef SpeechSynthesis_h
 #define SpeechSynthesis_h
 
-#include "core/dom/ContextLifecycleObserver.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
@@ -41,8 +40,7 @@ class PlatformSpeechSynthesizerClient;
 
 class MODULES_EXPORT SpeechSynthesis final
     : public EventTargetWithInlineData,
-      public PlatformSpeechSynthesizerClient,
-      public ContextLifecycleObserver {
+      public PlatformSpeechSynthesizerClient {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(SpeechSynthesis);
 
@@ -65,7 +63,9 @@ class MODULES_EXPORT SpeechSynthesis final
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(voiceschanged);
 
-  ExecutionContext* getExecutionContext() const override;
+  ExecutionContext* getExecutionContext() const override {
+    return m_executionContext;
+  }
 
   DECLARE_VIRTUAL_TRACE();
 
@@ -93,6 +93,7 @@ class MODULES_EXPORT SpeechSynthesis final
   // Returns the utterance at the front of the queue.
   SpeechSynthesisUtterance* currentSpeechUtterance() const;
 
+  Member<ExecutionContext> m_executionContext;
   Member<PlatformSpeechSynthesizer> m_platformSpeechSynthesizer;
   HeapVector<Member<SpeechSynthesisVoice>> m_voiceList;
   HeapDeque<Member<SpeechSynthesisUtterance>> m_utteranceQueue;