This is safe to enable multiple mac/win builders because we've migrated all
non-experimental builders to LUCI, hence pending queues won't affect CQ.

TBR=machenbach@chromium.org

No-Try: true
Bug: chromium:747960
Change-Id: I561c97ac52db0de042fb196f4430b65de562c0de
Reviewed-on: https://chromium-review.googlesource.com/836710
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50249}