GitLab

* Changes the accessibility focus order to Cancel button->PIN input->
  Pairing switch->Continue button.
* Makes the status label the default focus instead of the cancel button.

Bug: 770841
Change-Id: I02f0261a7b20da71485dacb4f7a09506fc09976b
Reviewed-on: https://chromium-review.googlesource.com/695838Reviewed-by: Scott Nichols <nicholss@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505852}