Use base::Optional for selected video track.

media/base/media_url_demuxer.cc

 // Copyright 2016 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.
 
 #include "media/base/media_url_demuxer.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 
 namespace media {
@@ skipping 57 matching lines @@
 base::Time MediaUrlDemuxer::GetTimelineOffset() const {
   return base::Time();
 }
 
 int64_t MediaUrlDemuxer::GetMemoryUsage() const {
   return 0;
 }
 
 void MediaUrlDemuxer::OnEnabledAudioTracksChanged(
     const std::vector<MediaTrack::Id>& track_ids,
-    base::TimeDelta currTime) {
+    base::TimeDelta curr_time) {
   NOTIMPLEMENTED();
 }
 void MediaUrlDemuxer::OnSelectedVideoTrackChanged(
-    const std::vector<MediaTrack::Id>& track_ids,
-    base::TimeDelta currTime) {
+    base::Optional<MediaTrack::Id> selected_track_id,
+    base::TimeDelta curr_time) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace media