nebraska: Fix unittests

It seems like we were not running any devserver unittests in CQ/pre-CQ
anymore/never? So this unittest failure slipped in crrev.com/c/1674247

This CL fixes the unittests

BUG=chromium:985429
TEST=platform/dev/run_unittest

Change-Id: I30e49e18af390fc58faa75bf9eefc0cc3064d10a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1708217
Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Nicolas Norvez <norvez@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
1 file changed