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Previously if user revokes the notification access they granted earlier
from the phone, notification set up UI cannot show up again unless you
close and reopen the bubble. This CL fixes this by observing the change
of notification access and update the view's visibility accordingly.

BUG=1141610, 1106937
TEST=unittested.

Change-Id: Ife8f19e7e5b8c2ec9ea12a7cc9e0e2cc739af72d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508398
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823377}