Chrome OS: Fix and re-enable OobeInteractiveUITest

Bug: 891277
Change-Id: I8d8733fd4ad1003a9f801d7b529d70572a3c248d
Reviewed-on: https://chromium-review.googlesource.com/c/1338882
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613401}
4 files changed