[subresource_filter] Enable Better Ads filtering by default

This enables both the filtering on better ads violating sites, and
also the feature which turns on the "Ads" setting.

Note that we still only sync the SUBRESOURCE_FILTER threat type
on chrome branded builds.

Bug: 737201
Change-Id: Icafe2d5ae1e995d18668a29ed5c3b9fca6fd20f4
Reviewed-on: https://chromium-review.googlesource.com/910669
Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536355}
4 files changed