Disable SupervisionOnboardingTest.ExitWhenServerSendsWrongHeader on Chrome OS

TBR=ltenorio@chromium.org

Bug: 965369
Change-Id: I379bb79e2929e4c733e966761e8291bad97167cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621777
Reviewed-by: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#661634}
1 file changed