‘Whitner, 26, who reportedly signed a three-year contract worth $11.5 million, ranked fifth in the NFL with 140 tackles last year, the only season in his five-year career in which he’s played 16 games. The deal signaled the end of free-agent safety Dashon Goldson’s four-year tenure as the Niners’ new regime continued to aggressively retool a defense which ranked 24th in the NFL against the pass last year. Goldson took to his Twitter account shortly after Whitner’s signing was reported.’