[RESTRICT AUTOMERGE] Remove DPMS#getProfileOwner in favor of getProfileOwnerAsUser

Test: atest DevicePolicyManagerTest
Test: atest CrossProfileAppsTest
Bug: 153995973
Change-Id: I103c45ea61814e476eea197d357ef0ce75edefdc
(cherry picked from commit 790348fbf190dc647188fc10d68f6d18cbf06b14)
5 files changed