getVpnLockdownUidRanges acquire lock and access internal state of a
Handler-based class (PermissionMonitor), which is bad practice in
general.
getVpnLockdownUidRanges returns keySet of mVpnLockdownUidRanges.
PermissionMonitor call updateUidLockdownRule and update the bpf map
based on mVpnLockdownUidRanges.
PermissionMonitorTest verifies the args of updateUidLockdownRule call.
So, It's not necessary to verify the mVpnLockdownUidRanges which
is internal states of PermissionMonitor.
Test: atest PermissionMonitorTest
Bug: 262199762
Change-Id: I85b39ab2aff44dcbe809b39560d6bb87fbb0c084
9a9c11e33e