Remove ContextLifecycleObserver from RemotePlayback

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h

Index: third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
diff --git a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
index 0a9e6e859eb061a75b435560c066f444d72e42f0..856ed7dadce1469f16a2ccd0992da1add61350ef 100644
--- a/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
+++ b/third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.h
@@ -8,7 +8,6 @@
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/TraceWrapperMember.h"
-#include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
@@ -30,7 +29,6 @@ class ScriptState;
 class MODULES_EXPORT RemotePlayback final
     : public EventTargetWithInlineData,
       public ActiveScriptWrappable,
-      public ContextLifecycleObserver,
       NON_EXPORTED_BASE(public WebRemotePlaybackClient) {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(RemotePlayback);
@@ -68,8 +66,6 @@ class MODULES_EXPORT RemotePlayback final
   // ScriptWrappable implementation.
   bool hasPendingActivity() const final;
 
-  void contextDestroyed() override;
-
   DEFINE_ATTRIBUTE_EVENT_LISTENER(connecting);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);