GitLab

Also migrated off HoverButton.

Bug: 1003911
Change-Id: If60bee2739530094e95fbe06584706a13f979ac7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846086
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704261}