WASHINGTON (Reuters) -Microsoft, which is seeking to wrap up its acquisition of game-maker Activision Blizzard, urged the U.S. Federal Trade Commission to withdraw a case against the deal that the agency had brought before an internal FTC judge, according to a motion posted to the FTC's website on Wednesday. Microsoft and Activision on Wednesday extended the deadline for the close of their $69 billion deal by three months to Oct. 18 as the American companies work to secure British approval for the biggest gaming deal in history. One was in district court, which refused last week to slap...