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When the SafeSitesFilterBehavior policy is enabled, filter top-level
HTTP[S] navigations using Google's SafeSearch API (porn classifier).

The SafeSites check is skipped if the URL is blacklisted or whitelisted
by policy.

This check is added to the existing PolicyBlacklistNavigationThrottle
instead of creating a standalone navigation throttle because it depends
on the blacklist/whitelist check that's already there, and conceptually
serves a similar purpose (determining if a URL should be blocked by
policy).

Bug: 819405
Change-Id: Ica243fdbf44b06a2fc4148fb68f47a11d9b79a6b
Reviewed-on: https://chromium-review.googlesource.com/1119102
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584681}