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