Unroll crusts into 9-in. pie plates; flute edges. Refrigerate 30 minutes. Preheat oven to 400°. Line unpricked crust with a double thickness of foil. Fill with pie weights, dried beans or uncooked rice. Bake on a lower oven rack until edges are light golden brown, 10-15 minutes. Remove foil and weights; bake until bottom is golden brown, 3-6 minutes longer. Cool on a wire rack; reduce heat to 350°., In a large bowl, combine the chicken, rice, eggs, soup, mayonnaise, onion, celery, lemon juice and salt. Spoon chicken mixture into pastry shells. Combine cornflakes and butter; sprinkle over tops. Bake on lowest oven rack until lightly browned, 20-25 minutes.