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When the system wakes up, it takes a few seconds for the correct
Bluetooth state to propogate to the app. A bad sync state allows
the lock screen to be unlocked even though the phone is not connected
in reality.

BUG=410082
TEST=manual

Review URL: https://codereview.chromium.org/528423002

Cr-Commit-Position: refs/heads/master@{#294104}