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Add "Verifying USB" sheet to USB UI flow and combine 'kInsertUsb' state
and 'kActivateUsb' state as it is shown in a single UI flow. As we do
not plan on implementing "Complete" UI sheet for initial version, this
completes the UI flow for USB security key use.

Bug: 849323
Change-Id: I8c1a8cbc8d4aedee557ac65c730b99295070a4ab
Reviewed-on: https://chromium-review.googlesource.com/1105403
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572071}