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If the device is disabled, it can be brought back to life only by the
admin of the domain. And to re-enable the device, admin needs the serial
number which might not match the data displayed on the sticker. Or the
sticker could be damaged. This change will provide the serial number on
the disabled device screen.

BUG=chromium:852284
TEST=Unit tests

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I3fe38afc59d7c08ffc175c723b1a37660d8b1160
Reviewed-on: https://chromium-review.googlesource.com/1101209Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Igor <igorcov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569218}