Remove a WTF that's popped up post-refactor.

The refactor I426d8365e4292df89f95c39ca2ac7b4dfe5728b9 started calling a method that was marked as not supposed to be called.  This was detected by a WIP change to make these WTF calls crash tests.

Bug: 378142453 
Change-Id: Ib422adb50b44d68ea4817c76feefd807b9589c4e
Flag: EXEMPT refactor
Test: SysUI builds, atest HeadsUpManagerImplTest