Migrate NavigationBarView to use RegionSamplingHelper

RegionSamplingHelper was a dupe of NavBarTintController.
Consolidate, extend, and migrate to use
RegionSamplingHelper going forward.

fixes: 138601292
Test: Tested phone with apps that have both light and
dark backgrounds, tested locking/unlocking, tested
livetime dynamic changes with the camera app with light
and dark backgrounds, tested orientation changes

Change-Id: Icbc34cdac5fce0befd0dfbde14e47c73fe22ed6e