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When I set up the bot I imagined it was a "buildbot" bot, but AFAIK
it will work fine in LUCI as well. Or actually, I have no idea, but
it appears the chromium.linux buildbot waterfall has gone away.

If there's no change needed on the recipe side, this should be
enough to fix it.

Bug: chromium:776284
Change-Id: I3cff6f866a241db1f4a60446480f6f7c40e95ef7
Reviewed-on: https://chromium-review.googlesource.com/991853Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548001}