From a Bears press release:
The Chicago Bears elevated G/C Edwin Williams from the practice squad to the 53-man roster and waived G Johan Asiata.
The Bears claimed Williams off of waivers on September 1. He was an undrafted free agent of the Redskins in 2009 and appeared in four games for Washington, starting two contests at right guard. Collegiately, the 6-3, 313-pound Williams started in the final 49 games of his career at the University of Maryland (2005-08), including starts in the final 39 contests at center.