This is moving all ANGLE Mac tryservers to run on LUCI only.

BUG=chromium:815092

Change-Id: I6d06fd881db9eb139dfc16c058d67396b321c183
Reviewed-on: https://chromium-review.googlesource.com/971342Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>