By Matt Audilet The Pittsburgh Steelers manufactured a big-time trade ahead of this year’s deadline — sending wide receiver Chase Claypool to the Chicago Bears. When word broke in the Pittsburgh locker room, veteran wide receiver Diontae Johnson seemed quite surprised. “CHICAGO!?” Johnson said, per team insider Chris Adamski. Johnson and Claypool have been teammates in Pittsburgh for the last three seasons. With Claypool out, Johnson’s already-leading role should take another step up. Rookie George Pickens will also see some increased activity. Claypool, a third-year wideout, has 32 catches fo…