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This makes the ads test the full integration of subresource_filter,
whereas before they were just faking callbacks.

Bug: None
Change-Id: Ic494324df522594278a6c225719fa0239d4b7b7a
Reviewed-on: https://chromium-review.googlesource.com/591912Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490993}