MILAN, Feb 22 : For a nation that measures itself in hockey gold, Sunday's heartbreaking 2-1 defeat to the United States in overtime was more than a lost final, it was a symbolic shift in a rivalry Canada has long considered its own to win. Canada, owners of nine Olympic men's hockey titles to the Americans' three, is a country whose national identity is intertwined with the sport.  This one will sting. "Losing hurts, doesn't matter who it's to," Canada's coach Jon Cooper said. "I look at this