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Instead of enabling lock screen authentication, store info about
local overrides in a pref and pass it to UsageTimeLimitProccessor
to calculate state.

That way local override is preserved in-between the sessions and
works consistently with remote overrides.

Bug: 911326
Test: UsageTimeLimitProcessorTest
Change-Id: I8135a2093f805188dd75b48d10c5c1a8aac1c711
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1497611
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638369}