gfe-relnote: Notify SendAlgorithm on neutered packets in QUIC. Protected by (enabling blocked) --gfe2_reloadable_flag_quic_avoid_overestimate_bandwidth_with_aggregation.

This is split from cl/279746200 for easier review. I'll unblock this flag in that cl.

PiperOrigin-RevId: 296301871
Change-Id: I499357505e3b817a82b6f4f2172f7b890b684b32
diff --git a/quic/core/congestion_control/bbr2_sender.cc b/quic/core/congestion_control/bbr2_sender.cc
index d795ad1..108cb34 100644
--- a/quic/core/congestion_control/bbr2_sender.cc
+++ b/quic/core/congestion_control/bbr2_sender.cc
@@ -284,6 +284,10 @@
                       is_retransmittable);
 }
 
+void Bbr2Sender::OnPacketNeutered(QuicPacketNumber packet_number) {
+  model_.OnPacketNeutered(packet_number);
+}
+
 bool Bbr2Sender::CanSend(QuicByteCount bytes_in_flight) {
   const bool result = bytes_in_flight < GetCongestionWindow();
   return result;