FONTANA, Calif. — Tony Stewart got his second NASCAR victory of the season Sunday when rain shortened the race at Auto Club Speedway by 71 laps. The defending Sprint Cup champion has won seven of the last 15 races in a remarkable stretch of dominance, including Las Vegas last month. Stewart's Chevrolet passed Kyle Busch 44 laps before the race was stopped when the looming rain clouds finally halted a race run entirely on green flags to that point.