relnote: Don't add burst tokens to QUIC's PacingSender when in recovery.

net/quic/congestion_control/pacing_sender.cc

Index: net/quic/congestion_control/pacing_sender.cc
diff --git a/net/quic/congestion_control/pacing_sender.cc b/net/quic/congestion_control/pacing_sender.cc
index 21dd4f34c0b77ca3a0612493a42b0f68cd7af56b..c5a9fa63ed77d2873165b5687ffc626d85f3daa3 100644
--- a/net/quic/congestion_control/pacing_sender.cc
+++ b/net/quic/congestion_control/pacing_sender.cc
@@ -62,7 +62,8 @@ bool PacingSender::OnPacketSent(
   if (has_retransmittable_data != HAS_RETRANSMITTABLE_DATA) {
     return in_flight;
   }
-  if (bytes_in_flight == 0) {
+  // If in recovery, the connection is not coming out of quiescence.
+  if (bytes_in_flight == 0 && !sender_->InRecovery()) {
     // Add more burst tokens anytime the connection is leaving quiescence, but
     // limit it to the equivalent of a single bulk write, not exceeding the
     // current CWND in packets.