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This CL fixes the problem with Gaia screen error overlay visibility.

Bug: 738806
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I741951a0d1d8ba511b37783cb5651fdc50a05378
Reviewed-on: https://chromium-review.googlesource.com/579287Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488385}