Remove RefPtr<ScriptState> from MediaSession

third_party/WebKit/Source/modules/mediasession/MediaSession.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MediaSession_h
 #define MediaSession_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "modules/ModulesExport.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/mediasession/media_session.mojom-blink.h"
 #include <memory>
 
 namespace blink {
 
+class ExecutionContext;
 class MediaMetadata;
-class ScriptState;
 
 class MODULES_EXPORT MediaSession final
     : public EventTargetWithInlineData,
+      public ContextLifecycleObserver,
       blink::mojom::blink::MediaSessionClient {
+  USING_GARBAGE_COLLECTED_MIXIN(MediaSession);
   DEFINE_WRAPPERTYPEINFO();
   USING_PRE_FINALIZER(MediaSession, dispose);
 
  public:
-  static MediaSession* create(ScriptState*);
+  static MediaSession* create(ExecutionContext*);
 
   void dispose();
 
   void setMetadata(MediaMetadata*);
   MediaMetadata* metadata() const;
 
   // EventTarget implementation.
   const WTF::AtomicString& interfaceName() const override;
   ExecutionContext* getExecutionContext() const override;
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(play);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(pause);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(playpause);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(previoustrack);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(nexttrack);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(seekforward);
   DEFINE_ATTRIBUTE_EVENT_LISTENER(seekbackward);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class MediaSessionTest;
 
-  MediaSession(ScriptState*);
+  explicit MediaSession(ExecutionContext*);
 
   // EventTarget overrides
   bool addEventListenerInternal(
       const AtomicString& eventType,
       EventListener*,
       const AddEventListenerOptionsResolved&) override;
   bool removeEventListenerInternal(const AtomicString& eventType,
                                    const EventListener*,
                                    const EventListenerOptions&) override;
 
   // blink::mojom::blink::MediaSessionClient implementation.
   void DidReceiveAction(blink::mojom::blink::MediaSessionAction) override;
 
   // Returns null when the ExecutionContext is not document.
-  mojom::blink::MediaSessionService* getService(ScriptState*);
+  mojom::blink::MediaSessionService* getService();
 
-  RefPtr<ScriptState> m_scriptState;
   Member<MediaMetadata> m_metadata;
   mojom::blink::MediaSessionServicePtr m_service;
   mojo::Binding<blink::mojom::blink::MediaSessionClient> m_clientBinding;
 };
 
 }  // namespace blink
 
 #endif  // MediaSession_h