Remove uses of deprecated SubsystemRegistration methods.

DecoratingSubsystemRegistration implements a couple deprecated methods in the SubsystemRegistration interface. Clean the up so we can remove them from the interface.

This will need to be a two-step process:

1) Remove the @Override annotations and make the methods throw UOE. This allows full WF to build against snapshots of core as we do the interface pruning work.

2) Once full is using a version of core with the pruned interface, delete the methods.