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Also, move win7-rel from master-only to chromium so it will
continue to run on the branches.

BUG=None

Change-Id: I46ee1c2095cccd9ba23332d8a94dc354f3ed3354
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315181Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791042}