Remove usage of hidden UserManager api.

Test: basic sanity with secondary users allowing and disallowing
calls
Bug: 137202333

Merged-in: Iec05205bc85601e8ea09d859c57a2ed99933c95d
Change-Id: Iec05205bc85601e8ea09d859c57a2ed99933c95d
(cherry picked from commit 2f489b7fe37d2c42181fb48b1029306616c0265a)
1 file changed