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Because we display a toast when the privacy screen setting changes,
we do not want to display it on initialization or switching users.

BUG=1040648

Change-Id: I7f507fa401e4c040f8dc3c531a3aaea91e3ff1fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079799
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Gil Dekel <gildekel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745363}