Add missing views_unittests target to chromium trybot.

It caused the patch in https://codereview.chromium.org/248763003/ to be
reverted and probably some others too.

BUG=None
TEST=green trybots
R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/257873004

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@266990 4ff67af0-8c30-449e-8e8b-ad334ec8d88c