Cleveland — Johnny Manziel’s weekend itinerary remains a mystery. The Browns were not commenting on a report that their polarizing quarterback, who sustained a concussion last week in Kansas City, went to Las Vegas on Saturday as his teammates got ready for their season finale. Manziel was not going to play Sunday against the Pittsburgh Steelers because he was in the N.F.L.’s protocol on head injuries. Manziel was hurt while rushing for 108 yards in a loss to the Chiefs. USA Today quoted an employee and patron who said they saw Manziel at Las Vegas’ Planet Hollywood on Saturday. The...