For the Vinaigrette, mix all ingredients in small bowl until well blended. Refrigerate 1/2 of the vinaigrette to use as dressing. Place chicken in large resealable plastic bag or glass dish. Add remaining vinaigrette; turn to coat well.
Refrigerate 30 minutes or longer for extra flavor. Remove chicken from marinade. Discard any remaining marinade.
Grill over medium-high heat 6 to 8 minutes per side or until chicken is cooked through, turning frequently. Cut chicken into thin slices.
Toss spinach, berries and pecans in large bowl. Divide among 4 plates. Arrange chicken over salad. Whisk reserved vinaigrette. Drizzle over salads.