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The ci buckets set module-level defaults so that if the triggered_by
field isn't set it will be triggered by the appropriate git poller, so
it is unnecessary to explicitly set it for builders that are only
scheduled by the poller.

Change-Id: I6f8e345ea60d84b821e7273a02f31a97589a687e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062011
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742263}