Remove unused TransportPacketsFeedback.first_unacked_send_time and prior_in_flight

Bug: none
Change-Id: Iabb5911a91e2d1ccfe7160cdfc83896a8960dab6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/345940
Reviewed-by: Diep Bui <diepbp@webrtc.org>
Auto-Submit: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Diep Bui <diepbp@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42006}
diff --git a/api/transport/network_types.h b/api/transport/network_types.h
index b8ef4e9..258a3a4 100644
--- a/api/transport/network_types.h
+++ b/api/transport/network_types.h
@@ -170,9 +170,7 @@
   ~TransportPacketsFeedback();
 
   Timestamp feedback_time = Timestamp::PlusInfinity();
-  Timestamp first_unacked_send_time = Timestamp::PlusInfinity();
   DataSize data_in_flight = DataSize::Zero();
-  DataSize prior_in_flight = DataSize::Zero();
   std::vector<PacketResult> packet_feedbacks;
 
   // Arrival times for messages without send time information.
diff --git a/modules/congestion_controller/rtp/transport_feedback_adapter.cc b/modules/congestion_controller/rtp/transport_feedback_adapter.cc
index be17e50..e81f579 100644
--- a/modules/congestion_controller/rtp/transport_feedback_adapter.cc
+++ b/modules/congestion_controller/rtp/transport_feedback_adapter.cc
@@ -158,17 +158,10 @@
 
   TransportPacketsFeedback msg;
   msg.feedback_time = feedback_receive_time;
-
-  msg.prior_in_flight = in_flight_.GetOutstandingData(network_route_);
   msg.packet_feedbacks =
       ProcessTransportFeedbackInner(feedback, feedback_receive_time);
   if (msg.packet_feedbacks.empty())
     return absl::nullopt;
-
-  auto it = history_.find(last_ack_seq_num_);
-  if (it != history_.end()) {
-    msg.first_unacked_send_time = it->second.sent.send_time;
-  }
   msg.data_in_flight = in_flight_.GetOutstandingData(network_route_);
 
   return msg;