Allow egg whites to stand at room temperature for 30 minutes (reserve yolks for another use). Prepare the pineapple filling and store in the refrigerator while preparing the cake. Grease three 8x1 1/2-inch round cake pans. Line bottoms of pans with parchment paper. Grease parchment paper only and lightly flour pans; set aside. In medium bowl stir together flour, baking powder, baking soda, and 3/4 teaspoon salt; set aside.