Make policy check independent of profile_ever_initialized

If a profile may have policy, but there's no "profile_requires_policy"
known_user attribute to confirm / negate this, require a policy check
regardless of whether the profile is assumed to have ever been
initialized.
Profiles that have not been used for several releases may require an
online sign-in as a side effect.

Bug: 731726, 928988
Test: browser_tests --gtest_filter=*UserCloudPolicyManagerTest*
Change-Id: Idbc98258a363ad51c3c940d580eb2d9c38e0ed03
Reviewed-on: https://chromium-review.googlesource.com/c/1464304
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631397}
5 files changed