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

media/audio/sounds/audio_stream_handler.h

Index: media/audio/sounds/audio_stream_handler.h
diff --git a/media/audio/sounds/audio_stream_handler.h b/media/audio/sounds/audio_stream_handler.h
index 2670025959787aa5631b6a4e00b98c2fac4c2537..2717590b9da13feb6108022dd684231cd060fd9e 100644
--- a/media/audio/sounds/audio_stream_handler.h
+++ b/media/audio/sounds/audio_stream_handler.h
@@ -7,6 +7,8 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string_piece.h"
@@ -69,7 +71,7 @@ class MEDIA_EXPORT AudioStreamHandler : public base::NonThreadSafe {
       AudioOutputStream::AudioSourceCallback* source);
 
   base::TimeDelta duration_;
-  scoped_ptr<AudioStreamContainer> stream_;
+  std::unique_ptr<AudioStreamContainer> stream_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioStreamHandler);
 };