Media Session: use dictionary instead of an interface for MediaImage.

third_party/WebKit/Source/modules/mediasession/MediaMetadata.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 MediaMetadata_h
 #define MediaMetadata_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/ModulesExport.h"
 #include "platform/Timer.h"
@@ skipping 17 matching lines @@
     : public GarbageCollectedFinalized<MediaMetadata>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static MediaMetadata* create(ExecutionContext*, const MediaMetadataInit&);
 
   String title() const;
   String artist() const;
   String album() const;
-  const HeapVector<Member<MediaImage>>& artwork() const;
+  const HeapVector<MediaImage>& artwork() const;
 
   void setTitle(const String&);
   void setArtist(const String&);
   void setAlbum(const String&);
-  void setArtwork(const HeapVector<Member<MediaImage>>&);
+  void setArtwork(const HeapVector<MediaImage>&);
 
   // Called by MediaSession to associate or de-associate itself.
   void setSession(MediaSession*);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   MediaMetadata(ExecutionContext*, const MediaMetadataInit&);
 
   // Called when one of the metadata fields is updated from script. It will
   // notify the session asynchronously in order to bundle multiple call in one
   // notification.
   void notifySessionAsync();
 
   // Called asynchronously after at least one field of MediaMetadata has been
   // modified.
   void notifySessionTimerFired(TimerBase*);
 
   String m_title;
   String m_artist;
   String m_album;
-  HeapVector<Member<MediaImage>> m_artwork;
+  HeapVector<MediaImage> m_artwork;
 
   Member<MediaSession> m_session;
   Timer<MediaMetadata> m_notifySessionTimer;
 };
 
 }  // namespace blink
 
 #endif  // MediaMetadata_h