Propagate MediaMetadata to Java side

content/browser/media/session/media_session_service_impl.h

Index: content/browser/media/session/media_session_service_impl.h
diff --git a/content/browser/media/session/media_session_service_impl.h b/content/browser/media/session/media_session_service_impl.h
index 60410dee17e1e39b7058238dc50e8502923e91da..ec737024ab9b7160ba6a3a77c5d5a1ee065b04c8 100644
--- a/content/browser/media/session/media_session_service_impl.h
+++ b/content/browser/media/session/media_session_service_impl.h
@@ -32,8 +32,6 @@ class MediaSessionServiceImpl : public blink::mojom::MediaSessionService {
 
   RenderFrameHost* render_frame_host_;
 
-  base::Optional<MediaMetadata> metadata_;
-
   // RAII binding of |this| to an MediaSessionService interface request.
   // The binding is removed when binding_ is cleared or goes out of scope.
   std::unique_ptr<mojo::Binding<blink::mojom::MediaSessionService>> binding_;