GitLab

This is a temporary measure to allow Layout Tests on Swarming to be
deployed on Mac while a solution to the problem is investigated.

This should also prevent developers from hitting this on their machine
locally.

BUG=736177
TBR=kbr@chromium.org,qyearsley@chromium.org,jeffcarp@chromium.org,ericrk@chromium.org,enne@chromium.org,dpranke@chromium.org,ccameron@chromium.org
NOTRY=true

Review-Url: https://codereview.chromium.org/2951323003
Cr-Commit-Position: refs/heads/master@{#481819}