Wrap tortillas in foil. Heat in 350°F oven 10-15 minutes until warm.
Coat large nonstick skillet with cooking spray.Place skillet over med-high heat. Add chicken, onion and garlic; saute until chicken is no longer pink in the center, 4-6 minutes. Stir in Worcestershire sauce, salt and pepper.
Divide chicken mixture among tortillas. Top each with lettuce and tomato. Drizzle each with 2-3 TBSP dressing. Roll up tortillas and serve.