Always Use ReportPageProcessPolicy on Ash

Process state reporting to resourced was split between TabManagerDelegate
and performance_manager. This is unnecessary and duplicates logic.
Instead, only report processes with ReportPageProcessPolicy.

Bug: b/308872526, b/304679315
Test: CQ, unit_tests
Change-Id: I429abecde10a46f1fb5d2f9df809c9f42353f4b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4996502
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Commit-Queue: Kameron Lutes <kalutes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1220659}