[ios] Revert back to a card style for settings.

The card style is now disabled behind a new IsSettingsUIRebootEnabled()
experimental flag.

These changes were inadvertently landed as part of
https://chromium-review.googlesource.com/c/chromium/src/+/1114605.

BUG=805213

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I7c22b635199810bab3332443e8a9251c073ca245
Reviewed-on: https://chromium-review.googlesource.com/1116919
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570748}
3 files changed