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Notifications should be shown only when app limit has changed. To
know if app limit has changed at the beginning of each session, check
if the new limit's update is after the latest seen before. If so, show
notification.

Bug: 1056463
Change-Id: I5a66563898c46cbee1b91e30d2306cfc68efebce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086254
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747440}