New York (Reuters) - Kirk Kerkorian's Tracinda Corp. on Wednesday backed off plans to restructure MGM Mirage Inc., effectively taking the casino operator off the block for now and causing a 10 percent drop in its share price. Tracinda, which owns 56 percent of MGM, had said in May that it planned to acquire the prized Bellagio and CityCenter properties in Las Vegas and consider a financial restructuring or other outcomes for the remainder of the company.