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This CL adds the skeleton for the unified consent service. The role of this service is to
manage the preferences for unified consent. The initial implementation adds the pref
that monitors whether the user has consented for URL-keyed anonymized data collection.
It also resets this preference to false when the user signs out of Chrome.

Design document: http://go/project-unity-dd (internal only).

Bug: 823809, 814973

Change-Id: If902eee16843b8df73b543c151e7155d966441a7
Reviewed-on: https://chromium-review.googlesource.com/1074658
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564774}