GitLab

- The sync icon is added.
- When there is no description text (e.g. sync is on),
  the sync info is made a hover button.
- The separator at the top is removed.

Screenshots:
https://drive.google.com/open?id=10kaxE5u_m6CgLaHZpf-6iz7LUK_T9Mcm
https://drive.google.com/open?id=1rssB_Q6tRzYosA7p7Nep3JwINEajzaXH
https://drive.google.com/open?id=1PwFOFAs_bAHseCarkAd7yo2f7-12J6ec

Bug: 995720
Change-Id: Ie1eb23e6eb62bd7accfd67a7c522dd0365b995a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847913Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704124}