Boldin says he’s aware of no locker-room gripes about Harbaugh

If, as Ann Killion of the San Francisco Chronicle recently reported, coach Jim Harbaugh’s “act has worn pretty thin” in the locker room, especially with some “face of the 49ers” players, receiver Anquan Boldin isn’t one of them. “He had a big role in me coming back,” Boldin said of Harbaugh in a conference call…