These sandwiches are generously stuffed, so we've wrapped them in parchment and cut them in half—right through the paper—to make them easier and less messy to eat. You can use wax paper if you don't have parchment.
Sprinkle chicken with salt and pepper. Place chicken and pear on a grill rack coated with cooking spray. Grill chicken 3 to 4 minutes on each side or until done. Grill pear 2 minutes on each side or until browned. Remove chicken and pear from grill; cut pear into 1/4-inch slices.
Combine arugula and Cranberry Vinaigrette in a large bowl; toss well. Place about 1 cup arugula mixture on each tortilla; top evenly with chicken and pear slices. Roll up tortillas, and wrap in parchment paper. Cut each wrap in half.