GitLab

This section shows:
- URL configured for each of the 3 sitelists
- Time of last refresh
- Time of next refresh
- A "Download now" button, to immediately refresh

To make the "download now" button more usable, the entire page's
contents also automatically refresh when LBS prefs change, or after
XML sitelists are downloaded.

https://imgur.com/a/yhRZnpZ

Bug: 959379
Change-Id: I7517491d95bc9c570232d2080ee5aeead270b674
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632001Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667292}