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The minimum chrome version policy enforces updates within a warning
time supplied by the admin. Once the device has installed the updates,
it is up to the relaunch notifications to enforce relaunch for
applying the updates.
This CL configures the relaunch notification according to the deadline
of the minimum chrome version policy if the relaunch deadline lies
post this policy deadline. It also overrides the relaunch notification
type to required.
Any further policy change to relaunch notification type, period and
heads up period would have no effect to enforce updates within the
policy deadline.

Bug: 1048607
Change-Id: I96a665a8feb494fd8a59d01e7dcb8155d8b07e0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270457
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786234}