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There's no reason to have a noop job triggered by a trigger: it is known
that it will not do any work and doesn't simplify any other code. The 2
noop jobs that were being triggered by a trigger are not set as children
of any builders in chromium_tests code, the fake builders exist only as
the builder for trybot mirrors.

Bug: 819899
Change-Id: Icfded342fc7c379e790f453fe3fe0196a1d3a483
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031045
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736908}