Place first 8 ingredients in a 3-qt. slow cooker. Cook, covered, on low until chicken is tender, 3-4 hours., Shred chicken with 2 forks. Stir in green onions., Spread chutney over 1 side of each naan. Top chutney side of 3 naan with chicken mixture; top with remaining naan, chutney side down., Cook sandwiches on a panini maker or indoor grill until golden brown, 6-8 minutes. To serve, cut each sandwich in half.