This is an automated CL created by the recipe roller. This CL rolls
recipe changes from upstream projects (recipe_engine) into this repository.

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+/4e80714e17ff99f6d750d54b69cf9cebd7a2f835
  4e80714 (gbeaty@chromium.org)
      Return None from CommitList.advance_to for backwards advances.

More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.

TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: If35f2ee09a01b6dd859a6eacb8e9f37483594872
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2654083Reviewed-by: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>