McDonald’s Corp. is pumping millions into renovating its 1,400 Canadian restaurants. The Oak Brook, Ill., burger chain, already revamping the look in 800 of its 14,000 U.S. outlets this year, is moving quickly to upgrade more than half of its Canadian locations by the end of the year. The remaining Canadian units will be renovated in 2012. Construction has already been completed in some Montreal and Toronto stores. As in the U.S., the focus is on speeding drive-through and production times and creating a more comfortable, casual dining atmosphere.