Removed QuicStreamIdManager::set_largest_peer_created_stream_id(). This change also includes a minor refactor in quic_stream_id_manager.cc with no behavior change. gfe-relnote: unused code. not protected. PiperOrigin-RevId: 301465430 Change-Id: I8c8013e4b4b211a45912216f3038a0ff60efdfce