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The devices they run on are continuously flashed to CrOS ToT, so running
branched Chrome on ToT CrOS can cause issues.

So this removes all CrOS HW tests from the branch builders. VM tests
will still run, and CrOS CI will still have CrOS-branch testing done.

Bug: 1097132
Change-Id: Ica19d0180baff979ac82fc68ad8947e94d0aee57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254703Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780911}