During the holiday break, rumors began spilling out of California that Ford and Google were about to announce a partnership on self-driving cars, and that Google-parent Alphabet was planning on using its autonomous vehicle experience to beat Uber to the punch with a self-driving ridesharing service. CES looked like the perfect stage on which to announce either of these plans, but Ford was silent, and Google largely absent. For now at least, Uber can safely continue to rely on Tesla to perfect its fledgling autonomous vehicle capabilities, at which point Uber has said it will place a very large order to Tesla cars, in its attempt to bypass the pesky contractors it currently pays to ferry customers around. But concrete…