Revert of Modify PeerConnection for end-to-end QuicDataChannel usage

webrtc/p2p/quic/quictransportchannel.cc

Index: webrtc/p2p/quic/quictransportchannel.cc
diff --git a/webrtc/p2p/quic/quictransportchannel.cc b/webrtc/p2p/quic/quictransportchannel.cc
index 29819c6269607b20aaf0ee23607721ea0bf68f48..e86fe6a0b2a666a5e3a6d958d157c5c659a1c860 100644
--- a/webrtc/p2p/quic/quictransportchannel.cc
+++ b/webrtc/p2p/quic/quictransportchannel.cc
@@ -395,8 +395,7 @@
 void QuicTransportChannel::OnSelectedCandidatePairChanged(
     TransportChannel* channel,
     CandidatePairInterface* selected_candidate_pair,
-    int last_sent_packet_id,
-    bool ready_to_send) {
+    int last_sent_packet_id bool ready_to_send) {
   ASSERT(channel == channel_.get());
   SignalSelectedCandidatePairChanged(this, selected_candidate_pair,
                                      last_sent_packet_id, ready_to_send);