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

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index d9af68fbdee6f04e101b714072c97949728c298a..d41f8f9144ee281c47b3bc3565265d2241522585 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -43,7 +43,7 @@ size_t GetStartOfEncryptedData(QuicConnectionIdLength connection_id_length,
                                bool include_version,
                                bool include_path_id,
                                QuicPacketNumberLength packet_number_length) {
-  // Don't include the fec size, since encryption starts before private flags.
+  // Encryption starts before private flags.
   return GetPacketHeaderSize(connection_id_length, include_version,
                              include_path_id, packet_number_length) -
          kPrivateFlagsSize;