Bridgestone/Firestone said it would take a $210 million charge to cover the cost of closing the Decatur factory. To complete the shutdown by December, as planned, the company must negotiate terms with the United Steelworkers of America, which represents the tire makers. Bridgestone/Firestone laid off about 1,100 factory workers, or about 10 percent of its work force in the United States, seven months ago. And a month ago, Ford announced that it would spend $3 billion to replace about 13 million Firestone tires because of safety concerns.