Chrome uses Chromium Updater aka Omaha 4 on macOS.
Keystone had a pretty mixed history on macOS, with things like the WindowServer bug and that one time it deleted the /var symlink. Do you know if the new updater is safer to use? I can't find out much about it.
> Do you know if the new updater is safer to use?
I have no data on that. All software has bugs, the updater included.