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At present, if a user turns down MultiDevice setup in OOBE, they will
see a notification prompting them to go through our regular setup flow.
In order to avoid spamming people with unwanted notifications, this CL
keeps track of if/when the user saw setup flow in OOBE and prevents
future setup prompting notifications if they have.

Bug: 892829, 884401
Change-Id: I231a25d7879b37912c8594998578eea9afadbf5e
Reviewed-on: https://chromium-review.googlesource.com/c/1275432
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600833}