Use main branch for chromiumos/config

Bug: 1155492
Change-Id: Ic317861da68766f3f13c73310e8c0d7288b86d9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2577624
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed