Convert //media/filters from scoped_ptr to std::unique_ptr

media/filters/ffmpeg_audio_decoder.h

Index: media/filters/ffmpeg_audio_decoder.h
diff --git a/media/filters/ffmpeg_audio_decoder.h b/media/filters/ffmpeg_audio_decoder.h
index f56479abb37968e3df756ccc7b51e1c0c4dd7ce8..214a2245e4b8696e2f3e52da7f8b8701584a00c5 100644
--- a/media/filters/ffmpeg_audio_decoder.h
+++ b/media/filters/ffmpeg_audio_decoder.h
@@ -6,10 +6,10 @@
 #define MEDIA_FILTERS_FFMPEG_AUDIO_DECODER_H_
 
 #include <list>
+#include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "media/base/audio_decoder.h"
 #include "media/base/demuxer_stream.h"
@@ -99,15 +99,15 @@ class MEDIA_EXPORT FFmpegAudioDecoder : public AudioDecoder {
   DecoderState state_;
 
   // FFmpeg structures owned by this object.
-  scoped_ptr<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
-  scoped_ptr<AVFrame, ScopedPtrAVFreeFrame> av_frame_;
+  std::unique_ptr<AVCodecContext, ScopedPtrAVFreeContext> codec_context_;
+  std::unique_ptr<AVFrame, ScopedPtrAVFreeFrame> av_frame_;
 
   AudioDecoderConfig config_;
 
   // AVSampleFormat initially requested; not Chrome's SampleFormat.
   int av_sample_format_;
 
-  scoped_ptr<AudioDiscardHelper> discard_helper_;
+  std::unique_ptr<AudioDiscardHelper> discard_helper_;
 
   scoped_refptr<MediaLog> media_log_;