GitLab

- Removes mobile provider label.
- Fixes spacing inconsistency.
- Hides sparator if there's no preceding content, i.e. in interstitial
  views.

Screenshots:
https://screenshot.googleplex.com/4ZSfevJhMoUZbZE.png
https://screenshot.googleplex.com/8oncKmfXsKrJRfp.png

BUG=1144232,1142885,1106937

Change-Id: I01e761c1507675a6d674481615c480348c76583c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511756
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Andre Le <leandre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823346}