Convert media/formats to std::unique_ptr

media/formats/mp4/box_reader.cc

Index: media/formats/mp4/box_reader.cc
diff --git a/media/formats/mp4/box_reader.cc b/media/formats/mp4/box_reader.cc
index 2ff5fe9588a29d188242f66f883e2e0e7e9f11a5..3b28bcaa3cfea0dfc681f4f65ae8ecebfbf06f83 100644
--- a/media/formats/mp4/box_reader.cc
+++ b/media/formats/mp4/box_reader.cc
@@ -6,10 +6,11 @@
 
 #include <stddef.h>
 #include <string.h>
+
 #include <algorithm>
+#include <memory>
 #include <set>
 
-#include "base/memory/scoped_ptr.h"
 #include "media/formats/mp4/box_definitions.h"
 
 namespace media {
@@ -116,7 +117,8 @@ BoxReader* BoxReader::ReadTopLevelBox(const uint8_t* buf,
                                       const int buf_size,
                                       const scoped_refptr<MediaLog>& media_log,
                                       bool* err) {
-  scoped_ptr<BoxReader> reader(new BoxReader(buf, buf_size, media_log, false));
+  std::unique_ptr<BoxReader> reader(
+      new BoxReader(buf, buf_size, media_log, false));
   if (!reader->ReadHeader(err))
     return NULL;