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This CL fixes the issue when one invalid "password changed" token
triggers online reauth two times - on the login screen and in the
session. Check in the session happens before the new token is backfilled
with the online login triggered on the login screen.
So this CL adds backoff time between two consecutive checks.
Also moved more relative logic into TokenHandleUtil.

Fixed: 1094030
Change-Id: Ica0a9c547f14e8f0bc743fdab87fff7bf49c56c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300441
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792655}