Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/media/base/media_message_loop.h

Index: chromecast/media/base/media_message_loop.h
diff --git a/chromecast/media/base/media_message_loop.h b/chromecast/media/base/media_message_loop.h
index 22abcea712d0723a68b261410b6070bc20e78c6d..a36853a4ee6708360b576208d1a9d0fd19161e3c 100644
--- a/chromecast/media/base/media_message_loop.h
+++ b/chromecast/media/base/media_message_loop.h
@@ -5,9 +5,10 @@
 #ifndef CHROMECAST_MEDIA_BASE_MEDIA_MESSAGE_LOOP_H_
 #define CHROMECAST_MEDIA_BASE_MEDIA_MESSAGE_LOOP_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 
 namespace base {
@@ -32,7 +33,7 @@ class MediaMessageLoop {
   MediaMessageLoop();
   ~MediaMessageLoop();
 
-  scoped_ptr<base::Thread> thread_;
+  std::unique_ptr<base::Thread> thread_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaMessageLoop);
 };