Remove redundant stream closure check in QUIC connection close. QuicStream::OnConnectionClose() will close the stream's write and read side. QuicSession::CloseStream() does the exact same thing. Thus it's unnecessary. Protected by gfe2_reloadable_flag_quic_do_not_close_stream_again_on_connection_close PiperOrigin-RevId: 319096629 Change-Id: I6553276b2df934d944bcce8f9683fadc3201790d