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

media/audio/win/audio_manager_win.h

Index: media/audio/win/audio_manager_win.h
diff --git a/media/audio/win/audio_manager_win.h b/media/audio/win/audio_manager_win.h
index 66b2426048335b0ade2b22af13d6bd0e8dbec8cf..d510f5c015f122812afc3000298b58b0398cb28a 100644
--- a/media/audio/win/audio_manager_win.h
+++ b/media/audio/win/audio_manager_win.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_
 #define MEDIA_AUDIO_WIN_AUDIO_MANAGER_WIN_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
@@ -92,7 +93,7 @@ class MEDIA_EXPORT AudioManagerWin : public AudioManagerBase {
   void GetAudioDeviceNamesImpl(bool input, AudioDeviceNames* device_names);
 
   // Listen for output device changes.
-  scoped_ptr<AudioDeviceListenerWin> output_device_listener_;
+  std::unique_ptr<AudioDeviceListenerWin> output_device_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
 };