Reason for revert:
Might have broken CQ.
Original issue's description:
> Add gerrit to cq.cfg
>
> BUG=chromium:672378
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2888533004
> Cr-Commit-Position: refs/heads/master@{#18177}
> Committed: 81a28f1174
TBR=tandrii@chromium.org,kjellander@webrtc.org,tandrii@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:672378
Review-Url: https://codereview.webrtc.org/2888113002
Cr-Commit-Position: refs/heads/master@{#18178}