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Unlocking by pressing the submit button is initially disabled, and only
enabled when Smart Lock finds the phone and the phone is unlocked.
This change makes sure that Smart Lock cleans up after itself if the
phone can no longer be found or becomes locked (making the submit button
disabled again).

Bug: 943211
Change-Id: Ie347cb009732fd60ac7ba27f13c44f337c3ae793
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1755187
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687367}