Those tests do real calls to rietveld. As we're moving away from this, we can skip testing it now.

BUG=chromium:701296
NOTRY=true
TBR=hablich@chromium.org

Change-Id: I44249160f7e35d4e2fac7aeb40889a825cfc5678
Reviewed-on: https://chromium-review.googlesource.com/454040Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43774}