To prepare sauce, combine first 4 ingredients in a small saucepan (A); bring to a boil. Reduce heat; simmer 25 minutes or until thick, stirring occasionally (B).
Remove from heat; stir in 1/8 teaspoon salt.
Pour into a small bowl; cool to room temperature.
Prepare grill to medium-high heat.
To prepare the chicken, sprinkle the chicken with 1/8 teaspoon salt and pepper.
Place chicken on a grill rack coated with cooking spray. Grill 4 minutes on each side or until done.