Remove is_fec_packet from TransmissionInfo and SerializedPacket. No functional change.

net/quic/quic_sent_packet_manager.cc

Index: net/quic/quic_sent_packet_manager.cc
diff --git a/net/quic/quic_sent_packet_manager.cc b/net/quic/quic_sent_packet_manager.cc
index 4eef7ba1f85d6f7bcced642b491d8cee11c52f45..e2ca91ee42807dc6a30d55df27cad7c5f31c24aa 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -339,9 +339,6 @@ void QuicSentPacketManager::RetransmitUnackedPackets(
         (retransmission_type == ALL_UNACKED_RETRANSMISSION ||
          it->encryption_level == ENCRYPTION_INITIAL)) {
       MarkForRetransmission(packet_number, retransmission_type);
-    } else if (it->is_fec_packet) {
-      // Remove FEC packets from the packet map, since we can't retransmit them.
-      unacked_packets_.RemoveFromInFlight(packet_number);
     }
   }
 }
@@ -561,16 +558,10 @@ bool QuicSentPacketManager::OnPacketSent(
     --pending_timer_transmission_count_;
   }
 
-  // Only track packets as in flight that the send algorithm wants us to track.
-  // Since FEC packets should also be counted towards the congestion window,
-  // consider them as retransmittable for the purposes of congestion control.
-  HasRetransmittableData has_congestion_controlled_data =
-      serialized_packet->is_fec_packet ? HAS_RETRANSMITTABLE_DATA
-                                       : has_retransmittable_data;
   // TODO(ianswett): Remove sent_time, because it's unused.
   const bool in_flight = send_algorithm_->OnPacketSent(
       sent_time, unacked_packets_.bytes_in_flight(), packet_number,
-      serialized_packet->encrypted_length, has_congestion_controlled_data);
+      serialized_packet->encrypted_length, has_retransmittable_data);
 
   unacked_packets_.AddSentPacket(serialized_packet, original_packet_number,
                                  transmission_type, sent_time, in_flight);