Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/media/cma/decoder/cast_audio_decoder_android.cc

 // Copyright 2015 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 "chromecast/media/cma/decoder/cast_audio_decoder.h"
 
 #include "base/logging.h"
 
 namespace chromecast {
 namespace media {
 
 // static
-scoped_ptr<CastAudioDecoder> CastAudioDecoder::Create(
+std::unique_ptr<CastAudioDecoder> CastAudioDecoder::Create(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     const media::AudioConfig& config,
     OutputFormat output_format,
     const InitializedCallback& initialized_callback) {
-  return scoped_ptr<CastAudioDecoder>();
+  return std::unique_ptr<CastAudioDecoder>();
 }
 
 // static
 int CastAudioDecoder::OutputFormatSizeInBytes(
     CastAudioDecoder::OutputFormat format) {
   switch (format) {
     case CastAudioDecoder::OutputFormat::kOutputSigned16:
       return 2;
     case CastAudioDecoder::OutputFormat::kOutputPlanarFloat:
       return 4;
   }
   NOTREACHED();
   return 1;
 }
 
 }  // namespace media
 }  // namespace chromecast