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

media/audio/pulse/pulse_output.h

Index: media/audio/pulse/pulse_output.h
diff --git a/media/audio/pulse/pulse_output.h b/media/audio/pulse/pulse_output.h
index 40a42701b956ebca6fbe3e8eb3628cc20513851f..b54436ce2fac698e825ebc574afdc94d5b401f04 100644
--- a/media/audio/pulse/pulse_output.h
+++ b/media/audio/pulse/pulse_output.h
@@ -23,10 +23,10 @@
 #include <pulse/pulseaudio.h>
 #include <stddef.h>
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "media/audio/audio_io.h"
 #include "media/base/audio_parameters.h"
@@ -111,7 +111,7 @@ class PulseAudioOutputStream : public AudioOutputStream {
   AudioSourceCallback* source_callback_;
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
-  scoped_ptr<AudioBus> audio_bus_;
+  std::unique_ptr<AudioBus> audio_bus_;
 
   base::ThreadChecker thread_checker_;