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

net/quic/quic_unacked_packet_map.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_
 #define NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_
 
 #include <stddef.h>
 
 #include <deque>
@@ skipping 157 matching lines @@
   // directly or through retransmissions.
   bool IsPacketUsefulForRetransmittableData(const TransmissionInfo& info) const;
 
   // Returns true if the packet no longer has a purpose in the map.
   bool IsPacketUseless(QuicPacketNumber packet_number,
                        const TransmissionInfo& info) const;
 
   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.
   // If the old packet is acked before the new packet, then the old entry will
   // be removed from the map and the new entry's retransmittable frames will be
   // set to nullptr.
   UnackedPacketMap unacked_packets_;
   // The packet at the 0th index of unacked_packets_.
   QuicPacketNumber least_unacked_;
 
   QuicByteCount bytes_in_flight_;
   // Number of retransmittable crypto handshake packets.
   size_t pending_crypto_packet_count_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicUnackedPacketMap);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_UNACKED_PACKET_MAP_H_