TOKYO (Reuters) McDonalds Holdings Co (Japan) Ltd has embarked on the emergency measure of only offering small-sized french fries to customers as a protracted labor dispute at U.S. West Coast ports has contributed to long delays in imports. The fast-food chain said it was importing more than 1,000 tonnes of frozen fries by air, which began arriving last Monday and had begun routing another 1,600 tonnes through ports on the U.S.