In 6-qt saucepan, combine first 7 ingredients. Over high heat bring to a boil; cover and reduce heat to low. Simmer for 40 minutes, stirring occasionally. Add beans, corn and chicken; increase heat to high until chili comes to a boil. Cover and reduce heat to low. Simmer for another 5 minutes, or until barley is tender. If upon standing the chili becomes too thick, add more chicken broth or water until chili is desired consistency. If desired, top with shredded cheese and sour cream.