Slight relaxing of Context.getUserId() checks.

Two specific managers have their own strategies using indirection to
obtain Context.getUserId(), and we're willing to special case these
to reduce warning noise.

Bug: 115654727, 159626156
Test: atest error_prone_android_framework_test
Change-Id: I290b74f7b6ec17c647f1cbb9ea7995f3fd56b132