GitLab

Apparently there is still an x11 chromeos bot. This should fix the
build for it.

TBR as this is trivial change to add ifdefs and should fix bot.

BUG=701068
TEST=none
TBR=erg@chromium.org

Change-Id: I55aad4f264ece847338e98eac635262c1583ac26
Reviewed-on: https://chromium-review.googlesource.com/576280Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487529}