If there's a user restriction on location sharing in a managed profile, always return empty string for location providers so that location can be disabled by the admin even if the primary user has location enabled. Also fix an incorrect update of the cache. Shouldn't update the primary user's cache when the caller is the managed profile. Bug: 17478855 Change-Id: Icab3459ae351c5cfc287e21df6a5ba1df9dfbdb4