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Before this CL, the notification was not shown because the stage was set
to UPGRADE_ANNOYANCE_NONE. This CL changes this logic such that if there
is no RelaunchNotification policy, this is set to UPGRADE_ANNOYANCE_LOW.

Fixed: 1019854
Change-Id: I63c58e9fbcea5f7b71983ed2e41d730e1f23cb95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900298
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715529}