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

media/base/text_track.h

 // Copyright (c) 2012 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_TEXT_TRACK_H_
 #define MEDIA_BASE_TEXT_TRACK_H_
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace media {
 
 class TextTrackConfig;
 
 class TextTrack {
  public:
   virtual ~TextTrack() {}
   virtual void addWebVTTCue(const base::TimeDelta& start,
                             const base::TimeDelta& end,
                             const std::string& id,
                             const std::string& content,
                             const std::string& settings) = 0;
 };
 
-typedef base::Callback<void
-    (scoped_ptr<TextTrack>)> AddTextTrackDoneCB;
+using AddTextTrackDoneCB = base::Callback<void(std::unique_ptr<TextTrack>)>;
 
-typedef base::Callback<void
-    (const TextTrackConfig& config,
-     const AddTextTrackDoneCB& done_cb)> AddTextTrackCB;
+using AddTextTrackCB = base::Callback<void(const TextTrackConfig& config,
+                                           const AddTextTrackDoneCB& done_cb)>;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEXT_TRACK_H_