OnUsernameChanged  212 chrome/browser/profiles/gaia_info_update_service.cc   OnUsernameChanged(username);
OnUsernameChanged  216 chrome/browser/profiles/gaia_info_update_service.cc   OnUsernameChanged(std::string());
OnUsernameChanged   51 chrome/browser/profiles/gaia_info_update_service.h   void OnUsernameChanged(const std::string& username);