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Clear information about profile policy requirements from known user
database when account type is changed. It will enforce establishing
the information again and fix problems resulting from incorrect
information being cached.

It fixes problem when policy is not fetched for account that changed
type to child when DMServerOAuthForChildUser is turned on.

Bug: 951238
Test: Manually changing account type and regular child user sign in
Change-Id: Iaab25af95d7f4dd818001aae1e2acab7cd0135e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1558901Reviewed-by: Drew Wilson <atwilson@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649675}