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

net/quic/quic_packet_creator.cc

Index: net/quic/quic_packet_creator.cc
diff --git a/net/quic/quic_packet_creator.cc b/net/quic/quic_packet_creator.cc
index 87f63dfa2fe8d7afd8690a43691c5d0655464b81..a0a38a5aa017dea90c1490e312eddb1c72d8623b 100644
--- a/net/quic/quic_packet_creator.cc
+++ b/net/quic/quic_packet_creator.cc
@@ -289,8 +289,7 @@ void QuicPacketCreator::ReserializeAllFrames(
   const QuicPacketNumberLength saved_next_length = next_packet_number_length_;
   const EncryptionLevel default_encryption_level = packet_.encryption_level;
 
-  // Temporarily set the packet number length, stop FEC protection,
-  // and change the encryption level.
+  // Temporarily set the packet number length and change the encryption level.
   packet_.packet_number_length = retransmission.packet_number_length;
   next_packet_number_length_ = retransmission.packet_number_length;
   packet_.needs_padding = retransmission.needs_padding;
@@ -301,7 +300,7 @@ void QuicPacketCreator::ReserializeAllFrames(
     packet_.encryption_level = retransmission.encryption_level;
   }
 
-  // Serialize the packet and restore the FEC and packet number length state.
+  // Serialize the packet and restore packet number length state.
   for (const QuicFrame& frame : retransmission.retransmittable_frames) {
     bool success = AddFrame(frame, false);
     DCHECK(success);