Replace scoped_ptr with std::unique_ptr in //media/base.

media/base/media_tracks.h

 // 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.
 
 #ifndef MEDIA_BASE_MEDIA_TRACKS_H_
 #define MEDIA_BASE_MEDIA_TRACKS_H_
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/media_track.h"
 
 namespace media {
 
 class AudioDecoderConfig;
 class VideoDecoderConfig;
 
 class MEDIA_EXPORT MediaTracks {
  public:
-  typedef std::vector<scoped_ptr<MediaTrack>> MediaTracksCollection;
+  using MediaTracksCollection = std::vector<std::unique_ptr<MediaTrack>>;
 
   MediaTracks();
   ~MediaTracks();
 
   // Callers need to ensure that track id is unique.
   void AddAudioTrack(const AudioDecoderConfig& config,
                      const std::string& id,
                      const std::string& kind,
                      const std::string& label,
                      const std::string& language);
@@ skipping 18 matching lines @@
   MediaTracksCollection tracks_;
   std::map<std::string, AudioDecoderConfig> audio_configs_;
   std::map<std::string, VideoDecoderConfig> video_configs_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaTracks);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_TRACKS_H_