The NFL head-coaching hiring season is over. The Cleveland Browns were the last team to make a hire when they chose Buffalo Bills defensive coordinator Mike Pettine.The Browns did some investigating of San Francisco 49ers assistants as did some other teams. But in the end, Jim Harbaugh's staff will remain, virtually the same. Here is a look at some 49ers' assistants who could get interest in 2015:Offensive coordinator Greg Roman: He interviewed in Minnesota and at Penn State this month.