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This CL fixes DCHECK on Chrome OS when trying to run Guest session from
the login screen.

Fixed: 1163345
Change-Id: I9b4ad69186dd217fc792d67c480743430b171664
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632653Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845255}