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Also, ClearSigninProfile now closes any browser window opened in the
profile. Ideally, no browsers would be open in the sign-in profile, but
we've had cases where that had happened.

BUG=906837,901768

Change-Id: Ia231d2ce3420c5c743bcd17f839ad00f4a851874
Reviewed-on: https://chromium-review.googlesource.com/c/1347105Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611442}