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

media/base/audio_fifo.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_AUDIO_FIFO_H_
 #define MEDIA_BASE_AUDIO_FIFO_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "media/base/audio_bus.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 // First-in first-out container for AudioBus elements.
 // The maximum number of audio frames in the FIFO is set at construction and
 // can not be extended dynamically.  The allocated memory is utilized as a
 // ring buffer.
@@ skipping 18 matching lines @@
   // Empties the FIFO without deallocating any memory.
   void Clear();
 
   // Number of actual audio frames in the FIFO.
   int frames() const;
 
   int max_frames() const { return max_frames_; }
 
  private:
   // The actual FIFO is an audio bus implemented as a ring buffer.
-  scoped_ptr<AudioBus> audio_bus_;
+  std::unique_ptr<AudioBus> audio_bus_;
 
   // Maximum number of elements the FIFO can contain.
   // This value is set by |frames| in the constructor.
   const int max_frames_;
 
   // Number of actual elements in the FIFO.
   int frames_pushed_;
   int frames_consumed_;
 
   // Current read position.
   int read_pos_;
 
   // Current write position.
   int write_pos_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioFifo);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_FIFO_H_