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Hide Quick Settings feature pods and some top-row shortcuts in Kiosk
Next sessions.

This also moves the SignOutButton's visibility logic to
TopShortcutsView, simplifying the button itself. This is in line with
how the other top-row shortcut buttons work.

Depending on user feedback, follow-up work might add some feature
pods back in, or remove the collapse/expand option. If we start
diverging more substantially from the normal Quick Settings, we can
create KioskNext versions of these classes instead.

Bug: 966890
Change-Id: I4c84e39021f213ca24fe8fcc39dd9b53a3119491
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638880
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666121}