Make //chromeos/settings a component

This includes some deps cleanup of //chromeos.

For explicit DEPS extraction:
TBR=sky@chromium.org

Bug: 918682
Change-Id: I551c9a78284e86aef229f7c12e9b8611d4514c07
Reviewed-on: https://chromium-review.googlesource.com/c/1405968
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622052}
13 files changed