Remove FEC related connection options and update FEC related comment in code base.

net/quic/quic_unacked_packet_map.h

Index: net/quic/quic_unacked_packet_map.h
diff --git a/net/quic/quic_unacked_packet_map.h b/net/quic/quic_unacked_packet_map.h
index 8ed6d0a0b4b416cf2aec370eb429322f9a43c671..31fc7f430088d14e26369614460e754a5a5831e2 100644
--- a/net/quic/quic_unacked_packet_map.h
+++ b/net/quic/quic_unacked_packet_map.h
@@ -175,8 +175,8 @@ class NET_EXPORT_PRIVATE QuicUnackedPacketMap {
   QuicPacketNumber largest_sent_packet_;
   QuicPacketNumber largest_observed_;
 
-  // Newly serialized retransmittable and fec packets are added to this map,
-  // which contains owning pointers to any contained frames.  If a packet is
+  // Newly serialized retransmittable packets are added to this map, which
+  // contains owning pointers to any contained frames.  If a packet is
   // retransmitted, this map will contain entries for both the old and the new
   // packet. The old packet's retransmittable frames entry will be nullptr,
   // while the new packet's entry will contain the frames to retransmit.