GitLab

We've disabled these on Windows and ChromeOS, so it's no surprise that
we need to disable them on macOS as well.

R=zmo

Fixed: 1163111
Change-Id: I406e6ebd1d27da84964e46efb9582ce77f904dac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613560Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841116}