NORMAN — Dillon Gabriel looked all healed up.
The Oklahoma quarterback passed for 403 yards and two touchdowns in his first game back after a concussion, and the Sooners defeated No. 19 Kansas 52-42 on Saturday to end their three-game losing streak. Gabriel was injured in the second quarter of Oklahoma’s loss to Texas Christian on Oct. 1, and the team’s offense had sputtered in nearly seven quarter…