Starbucks is laying off 300 U.S. workers and closing several regional corporate offices in the latest move by Chief Executive Brian Niccol to turn the coffee chain around. Starbucks said the 300 U.S. corporate roles are based in Seattle along with remote positions scattered around the country. The company said it is closing regional corporate offices in Chicago, Atlanta, Dallas and Burbank, Calif. It will maintain North American regional offices in New York, Toronto and Coral Gables, Fla., along with its Seattle headquarters and a new Nashville, Tenn., corporate hub.