first_server_index_  680 net/dns/dns_transaction.cc         (first_server_index_ + attempt_number) % config.nameservers.size();
first_server_index_  762 net/dns/dns_transaction.cc     first_server_index_ = session_->NextFirstServerIndex();
first_server_index_  925 net/dns/dns_transaction.cc   int first_server_index_;