for (std::set<PP_Resource>::iterator it = files_.begin();
it != files_.end(); ++it) {
EnterResourceNoLock<PPB_FileIO_API> enter(*it, true);
for (std::set<PP_Resource>::iterator it = files_.begin();
it != files_.end(); ++it) {
EnterResourceNoLock<PPB_FileIO_API> enter(*it, true);