All builders look WAI now, so flipping.
In particular, the android bots have been migrated in place to LUCI,
so the buildbot varients should no longer work.

No-Try: True
Bug:869249
Change-Id: Iab96cab5d92a106df67fc2458150c0dc93b77fc4
Reviewed-on: https://chromium-review.googlesource.com/1169593Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>