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

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

Index: third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
index bd013cfb54060ab05a31ba4e5cafd657b313c8de..6b80be9e299e5e227b1b7a60a013f348a24805dc 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
+++ b/third_party/WebKit/Source/modules/mediasession/MediaMetadata.h
@@ -35,12 +35,12 @@ class MODULES_EXPORT MediaMetadata final
   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*);
@@ -62,7 +62,7 @@ class MODULES_EXPORT MediaMetadata final
   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;