Remove QuicSentPacketManager::DebugVisitor's OnSentPacket, since it's

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 a062827b657525b3b1873d2b6ed1c33c9429a55d..f5b2c7363f309ae8293a86b2796bbfb2ed733049 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -503,13 +503,6 @@ bool QuicSentPacketManager::OnPacketSent(
   DCHECK_LT(0u, sequence_number);
   DCHECK(!unacked_packets_.IsUnacked(sequence_number));
   LOG_IF(DFATAL, bytes == 0) << "Cannot send empty packets.";
-  if (debug_delegate_ != nullptr) {
-    debug_delegate_->OnSentPacket(*serialized_packet,
-                                  original_sequence_number,
-                                  sent_time,
-                                  bytes,
-                                  transmission_type);
-  }
 
   if (original_sequence_number == 0) {
     if (serialized_packet->retransmittable_frames) {