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This dependency is no longer required, this CL just cleans up some
includes and makes a minor change to
FakeAuthPolicyClient::RefreshUserPolicy to remove the cryptohome
dependency and support tests.

For minor fix to chrome/browser/chromeos/policy/ includes:
TBR=emaxx@chromium.org

Bug: 863439
Change-Id: I519ea33d7e5ad9355c45bfc172f97a4cb51b8122
Reviewed-on: https://chromium-review.googlesource.com/1165491
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581611}