Add option to use KidsManagement url checker according to flag.

feature(supervised_user_url_filter): use KidsManagementURLCheckerClient

BUG=934444

Change-Id: I91461a92721b74620722b895a5ecf743f15ae56b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1481493
Commit-Queue: Caio Lima <caiol@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643366}
5 files changed