The San Francisco 49ers and cornerback Tramaine Brock agreed to a four-year contract extension Friday worth $16 million with $7 million guaranteed, a person informed of the deal told NFL Media Insider Ian Rapoport. Brock's extension with the 49ers comes as he readies for his first career start Monday night versus the Washington Redskins. Source: NFL.com ICECOLD's Take: Oh boy... probably means Brown is as good as gone in the offseason