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This CL fixes a bug in which we do not remove
PrivacyScreenToastController as an observer of PrivacyScreenController
during destruction.

Bug: b:157775487, 1090385
Change-Id: I97f0740a2a97493750e2f751ae2eb390b743df2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225863Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774314}