GitLab

The feature launched more than half a year ago, so it's a
high time to cleanup. Also removed code in other files that
is related to this feature flag.

Bug: 1120085
Change-Id: Ia64376339f6aebbf20b7d494cda4e6d26a7785a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469234
Commit-Queue: Xiqi Ruan <xiqiruan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817552}