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      system tray still works

Bug: 327885
Test: sign into one user, start signin to a second user, cancel;
Change-Id: I9fa93bbd87a1f4a0087746e3a42ead07ee308710
Reviewed-on: https://chromium-review.googlesource.com/1008825
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551120}