San Francisco 49ers head coach Jim Harbaugh smiles as he watches his team warm up before an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. Harbaugh underwent a minor procedure for an irregular heartbeat Thursday, Nov. 15. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jason Campbell (2) is sacked by San Francisco 49ers linebacker Aldon Smith, left, as defensive tackle Justin Smith (94) converges during the first quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis (85) and quarterback Colin Kaepernick (7) celebrate after connecting on a 3-yard touchdown pass during the first quarter of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis (85) catches a 3-yard touchdown pass in front of Chicago Bears strong safety Major Wright (21) during the first quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis (85) and quarterback Colin Kaepernick (7) celebrate after connecting on a 3-yard touchdown pass during the first quarter of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) is sacked by San Francisco 49ers linebacker Aldon Smith (99) as defensive tackle Justin Smith (94) follows the play during the first quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Kendall Hunter (32) scores on a 14-yard touchdown run past Chicago Bears free safety Chris Conte (47) during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Kendall Hunter (32) celebrates after scoring on a 14-yard touchdown run in front of Chicago Bears' Nick Roach (53) during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers cornerback Tarell Brown (25) celebrates with linebacker Patrick Willis (52) and safety Donte Whitner (31) after intercepting a pass from Chicago Bears quarterback Jason Campbell during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore (21) jumps past Chicago Bears strong safety Major Wright (21) during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) recovers his own fumble after being sacked by San Francisco 49ers linebacker Aldon Smith (99) during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis (85) runs with a pass against Chicago Bears free safety Chris Conte (47) and outside linebacker Lance Briggs (55) during the first half of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore (21) leaps past Chicago Bears strong safety Major Wright (21) during the second quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers linebacker Aldon Smith (99) is congratulated by linebacker Ahmad Brooks after sacking Chicago Bears quarterback Jason Campbell (2) during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) is sacked by San Francisco 49ers linebacker Aldon Smith (99) during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) talks with head coach Jim Harbaugh during the first half of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers wide receiver Michael Crabtree (15) celebrates with quarterback Colin Kaepernick (7) and guard Mike Iupati after scoring on a 10-yard touchdown reception against the Chicago Bears during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) runs away from Chicago Bears defensive end Julius Peppers (90) and defensive tackle Nate Collins (93) during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers linebacker NaVorro Bowman (53) celebrates after a tackle against the Chicago Bears during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears head coach Lovie Smith stands on the sideline during the third quarter of an NFL football game against the San Francisco 49ers in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) is looked over by teammates after being tackled during the second half of an NFL football game against the San Francisco 49ers in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears wide receiver Brandon Marshall catches a 13-yard touchdown pass over San Francisco 49ers cornerback Chris Culliver (29) during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) sits on the bench as he is looked over by a team physician during the second half of an NFL football game against the San Francisco 49ers in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) passes against the Chicago Bears during the second half of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers head coach Jim Harbaugh gestures during the second half of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jason Campbell (2) gets off the ground after being tackled during the second half of an NFL football game against the San Francisco 49ers in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jason Campbell (2) is sacked by San Francisco 49ers defensive tackle Justin Smith (94) and linebacker Aldon Smith, not pictured, during the fourth quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. The 49ers won 32-7. (AP Photo/Tony Avelar)

San Francisco 49ers head coach Jim Harbaugh, second from left, yells to officials during the fourth quarter of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. The 49ers won 32-7. (AP Photo/Tony Avelar)

Chicago Bears quarterback Jason Campbell walks on the field during the fourth quarter of an NFL football game against the San Francisco 49ers in San Francisco, Monday, Nov. 19, 2012. The 49ers won 32-7. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers linebacker Aldon Smith (99) smiles as he talks with quarterback Colin Kaepernick (7) during the fourth quarter of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. The 49ers won 32-7. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Colin Kaepernick (7) smiles at the end of their 32-7 win over the Chicago Bears in an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) celebrates with fans at the end of their 32-7 win over the Chicago Bears in an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers inside linebacker Patrick Willis (52) celebrates at the end of their 32-7 win over the Chicago Bears in an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Chicago Bears quarterback Jason Campbell (2) sits on the bench in the closing seconds of their 32-7 loss to the San Francisco 49ers in an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

El quarterback Colin Kaepernick lanza un pase contra los Bears en la segunda mitad del partido que los 49ers ganaron 32-7 el lunes 19 de noviembre de 2012 en San Francisco. (Foto AP/Tony Avelar)

FILE - This Nov. 19, 2012 file photo shows San Francisco 49ers tight end Vernon Davis (85) running with a pass against Chicago Bears free safety Chris Conte (47) and outside linebacker Lance Briggs (55) during the first half of an NFL football game in San Francisco. Davis enters San Francisco’s NFC divisional playoff against the Green Bay Packers on Saturday night, Jan. 12, 2013, determined as ever to make his mark again. (AP Photo/Tony Avelar, FIle)

FILE - In this Nov. 19, 2012 file photo, San Francisco 49ers quarterback Alex Smith, left, talks with former quarterback and NFL broadcaster Steve Young before an NFL football game against the Chicago Bears in San Francisco. A person with knowledge of the trade tells The Associated Press that the Kansas City Chiefs have agreed to acquire Smith from San Francisco. The person spoke on condition of anonymity on Wednesday, Feb. 27, 2013, because the trade does not become official until March 12, when the NFL's new business year begins. (AP Photo/Tony Avelar, File)

ADVANCE FOR WEEKEND EDITIONS, MARCH 9-10 - FILE - In this Nov. 19, 2012, file photo, San Francisco 49ers defensive tackle Justin Smith, top, and linebacker Aldon Smith, not pictured, sack Chicago Bears quarterback Jason Campbell (2) during the second half of an NFL football game in San Francisco. (AP Photo/Tony Avelar, File

In this Monday, Nov. 19, 2012 photo, Chicago Bears middle linebacker Brian Urlacher (54) runs the field against the San Francisco 49ers during the second half of an NFL football game in San Francisco. Most of the big names hitting NFL free agency in 2013 aren't big stars anymore. While Ed Reed is coming off a Super Bowl season in Baltimore and Wes Welker catches 100 passes every year, this crop is more about aging defensive players such as Charles Woodson, Urlacher and Ronde Barber. (AP Photo/Marcio Jose Sanchez)

FILE - In this Nov. 19, 2012, file photo, Chicago Bears middle linebacker Brian Urlacher chases a play against the San Francisco 49ers during the second half of an NFL football game in San Francisco. The Bears announced on Wednesday, March 20, 2013, that they were unable to reach a contract agreement with Urlacher, who is an unrestricted free agent for the first time in his career. (AP Photo/Marcio Jose Sanchez, File)

FILE - In this Nov. 19, 2012, file photo, Chicago Bears middle linebacker Brian Urlacher (54) warms up before an NFL football game against the San Francisco 49ers in San Francisco. The Bears announced on Wednesday, March 20, 2013, that they were unable to reach a contract agreement with Urlacher, who is an unrestricted free agent for the first time in his career. (AP Photo/Marcio Jose Sanchez, File)