LAS VEGAS — Southern California wrapped up its rocky season by rolling over Fresno State in the Las Vegas Bowl. Cody Kessler passed for 344 yards and a bowl-record four touchdowns in the Trojans' 45-20 victory over the 21st-ranked Bulldogs on Saturday under Clay Helton, their third head coach in less than three months. Marqise Lee and Nelson Agholor had two touchdown catches apiece, Javorius Allen rushed two more scores, and the Trojans (10-4) answered every question about their motivation by dancing on the sideline while routing a BCS contender for the storied program's first postseason victory since 2009.