Cleanups in PriorityHelper.

- Rename methods to more clearly tell what they are doing.
- Update similar methods to work in a similar way.
- Remove circular dependencies with permissionHelper

Bug: 369976930
Flag: NONE refactor and small tweaks to reuse code.
Test: presubmit
Change-Id: I1a7ac153e5518e0a7bea9dcf22d56c7a2fa13b61
8 files changed