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Previously, when using Search + Arrow to navigate through
VPN quick settings, there was no stop on the disconnect
button for a connected VPN.  This change also updates the
a11y labels for both the VPN row and disconnect button
to identify what action is performed.

Bug: 760222
Change-Id: I0bc1ea2930c874255f9dfd9601b2741810fbc4f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1938041Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jon Mann <jonmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721357}