Roughly a year ago, apparently. It didn't actually happen, mind you; it's just that his costume became more reminiscent of his original Robin costume, and the bottom that he had started out his career as Robin was brought back into continuity. Until recently (when he changed his codename to the ever-inventive “Drake”), he has been Red Robin; but ever since the New 52 began, everything that distinguished Red Robin from Robin has been stripped away, so that he might as well still have been Robin.