Convert MediaSession to new Mojo types

This CL converts MediaSessionPtr that is left only in
AudioFocusRequest class to the new Mojo type.

Bug: 955171
Change-Id: I8df4442456914cdeace7b3395d1596044ae4616d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850676Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#705926}

services/media_session/audio_focus_request.cc

@@ -30,7 +30,7 @@ AudioFocusRequest::AudioFocusRequest(
   // Listen for mojo errors.
   receiver_.set_disconnect_handler(base::BindOnce(
       &AudioFocusRequest::OnConnectionError, base::Unretained(this)));
-  session_.set_connection_error_handler(base::BindOnce(
+  session_.set_disconnect_handler(base::BindOnce(
       &AudioFocusRequest::OnConnectionError, base::Unretained(this)));
 }
 

services/media_session/audio_focus_request.h

@@ -9,6 +9,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "mojo/public/cpp/bindings/receiver.h"
+#include "mojo/public/cpp/bindings/remote.h"
 #include "services/media_session/public/mojom/audio_focus.mojom.h"
 #include "services/media_session/public/mojom/media_controller.mojom.h"
 
@@ -94,7 +95,7 @@ class AudioFocusRequest : public mojom::AudioFocusRequestClient {
 
   std::unique_ptr<MediaController> controller_;
 
-  mojom::MediaSessionPtr session_;
+  mojo::Remote<mojom::MediaSession> session_;
   mojom::MediaSessionInfoPtr session_info_;
   mojom::AudioFocusType audio_focus_type_;