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This will allow teams to own flags without either having a team email alias or
having to list all their team members in each flag entry.

Bug: 897809
Change-Id: I960c3327b5175e92abbb1cf1ad3e2832b1d1cfb6
Reviewed-on: https://chromium-review.googlesource.com/c/1344190
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609736}