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Further adjustments may be required once branch sheriff responsibilities
are clarified and a more maintainable solution can be crafted.

Change-Id: I30df4e95e9d57c6b330f4d75af0e31c35500efa2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2243712
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777971}