Remove fat from chicken. Cut chicken into 3/4-inch cubes. In 4-quart Dutch oven, heat 1/2 cup of the broth to boiling. Cook chicken in broth about 5 minutes, stirring occasionally, until white. Remove chicken from broth with slotted spoon.
Add garlic and chiles to broth in Dutch oven; cook over medium-high heat 2 minutes, stirring frequently. Stir in flour. Cook over low heat 2 minutes, stirring constantly. Gradually stir in remaining broth.
Stir in chicken and remaining ingredients except cornstarch, water and tortilla chips. Heat to boiling; reduce heat. Cover; simmer about 20 minutes, stirring occasionally, until chicken is no longer pink in center.
Mix cornstarch and cold water; stir into stew. Cook, stirring frequently, until thickened and thoroughly heated. Serve sprinkled with tortilla chips.