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

media/audio/cras/cras_input.h

Index: media/audio/cras/cras_input.h
diff --git a/media/audio/cras/cras_input.h b/media/audio/cras/cras_input.h
index 749bf23390498350e24581d01a3be9dfc36a424b..7dfe215f8896abc4457c15fd064f4d097e37059b 100644
--- a/media/audio/cras/cras_input.h
+++ b/media/audio/cras/cras_input.h
@@ -9,6 +9,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
@@ -110,7 +111,7 @@ class MEDIA_EXPORT CrasInputStream : public AgcAudioStream<AudioInputStream> {
   // True if the stream is a system-wide loopback stream.
   bool is_loopback_;
 
-  scoped_ptr<AudioBus> audio_bus_;
+  std::unique_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasInputStream);
 };