Removed references to ProcessRecord in ActivityStackSupervisor (25/n)

Once ActivityStackSupervisor is moved to WM package it will no longer have
access to ProcessRecord. This Cl fixes ActivityStackSupervisor to use
WindowProcessController before the move.

Bug: 80414790
Test: Existing tests pass
Change-Id: I09311d30d7a2615ed08cbce38d9d4419aa35e6e0
5 files changed