[ios] Updates the styling of the CopiedToChrome settings cell.

Updates the cell to use new fonts and text colors when the UIRefresh
experiment is enabled. Fixes constraint errors that were causing
ambiguous layout in the cell. Adds horizontal padding around the sides
of the cell to visually separate the button from the trailing edge of
the cell.

BUG=805213

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iaabc27c512b3a729891813372ac05326c4039e35
Reviewed-on: https://chromium-review.googlesource.com/1131561
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573826}
3 files changed