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It's a speculative fix for
https://listnr.corp.google.com/product/5015361/report/85785278442. In
the report, the reporter observed (from offline email):
1. opened up my mewoth/brydge
2. noticed that brydge kb wasn't working, checked quick settings menu
   and noticed bluetooth was missing
3. tried to enter password but no virtual kb came up

Since there is not a consistently repro way to repro this, my guess is
the Bluetooth stack was broken somehow but Chrome didn't get notified.
With this CL, the device should be able (hopefully) to enter the correct
ui mode and have the virtual keyboard if Bluetooth stack is broken.

Bug: None. See description
Change-Id: Ic04a769c111f772211e99c25d187726b46429626
Reviewed-on: https://chromium-review.googlesource.com/c/1337011Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608261}