Convert //ppapi to use std::unique_ptr

ppapi/proxy/media_stream_video_track_resource.cc

Index: ppapi/proxy/media_stream_video_track_resource.cc
diff --git a/ppapi/proxy/media_stream_video_track_resource.cc b/ppapi/proxy/media_stream_video_track_resource.cc
index 2942ff574fb598021ada98cd2fadb3dd6ae06f44..0f68000885f828b10094a709d40e46772c565d93 100644
--- a/ppapi/proxy/media_stream_video_track_resource.cc
+++ b/ppapi/proxy/media_stream_video_track_resource.cc
@@ -191,7 +191,7 @@ PP_Resource MediaStreamVideoTrackResource::GetVideoFrame() {
   scoped_refptr<VideoFrameResource> resource =
       new VideoFrameResource(pp_instance(), index, buffer);
   // Add |pp_resource()| and |resource| into |frames_|.
-  // |frames_| uses scoped_ptr<> to hold a ref of |resource|. It keeps the
+  // |frames_| uses std::unique_ptr<> to hold a ref of |resource|. It keeps the
   // resource alive.
   frames_.insert(FrameMap::value_type(resource->pp_resource(), resource));
   return resource->GetReference();