Also skip the slowest test.

TBR=sergiyb@chromium.org
NOTRY=true

Change-Id: I9646dc750fafe47a0680e57ed029ab24a521d1a3
Reviewed-on: https://chromium-review.googlesource.com/c/1273885Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56535}