Bears sign special teamer Blake Costanzo

The 49ers never offered a contract to free agent special teamer Blake Costanzo, so the Chicago Bears swooped in. Costanzo signed a two-year deal with the Bears on Tuesday night, the San Francisco Chronicle confirms. Costanzo, who turns 28 in April, racked up 17 special teams tackles for the 49ers in 2011. He won’t help Chicago much…