Tribune Co. said it has completed the acquisition of independent television station KTLA Channel 5 in Los Angeles for $510 million and working capital . . . General Motors Acceptance Corp., a unit of General Motors, filed a shelf registration with the Securities and Exchange Commission for as much as $5 billion of medium-term notes . . . A unit of Revlon filed suit against Vidal Sassoon to bar use of the Colorific trade name on a new product line . . . The Soviet Union has purchased an additional 142,000 metric tons of U.S. corn--about 5.6 million bushels--for delivery in the coming year, the Agriculture Department reported . . . European Economic Community foreign ministers failed to reach a common position on how to handle the financial crisis facing the International Tin Council, participants reported.