deprecating FLAGS_quic_ack_notifier_informed_on_serialized.

net/quic/quic_sent_packet_manager.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_sent_packet_manager.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 543 matching lines @@
     QuicPacketSequenceNumber original_sequence_number,
     QuicTime sent_time,
     QuicByteCount bytes,
     TransmissionType transmission_type,
     HasRetransmittableData has_retransmittable_data) {
   QuicPacketSequenceNumber sequence_number = serialized_packet->sequence_number;
   DCHECK_LT(0u, sequence_number);
   DCHECK(!unacked_packets_.IsUnacked(sequence_number));
   LOG_IF(DFATAL, bytes == 0) << "Cannot send empty packets.";
 
-  if (original_sequence_number == 0) {
-    if (!FLAGS_quic_ack_notifier_informed_on_serialized &&
-        serialized_packet->retransmittable_frames) {
-      ack_notifier_manager_.OnSerializedPacket(*serialized_packet);
-    }
-  } else {
+  if (original_sequence_number != 0) {
     PendingRetransmissionMap::iterator it =
         pending_retransmissions_.find(original_sequence_number);
     if (it != pending_retransmissions_.end()) {
       pending_retransmissions_.erase(it);
     } else {
       DLOG(DFATAL) << "Expected sequence number to be in "
                    << "pending_retransmissions_.  sequence_number: "
                    << original_sequence_number;
     }
     // Inform the ack notifier of retransmissions so it can calculate the
@@ skipping 430 matching lines @@
   // Set up a pacing sender with a 1 millisecond alarm granularity, the same as
   // the default granularity of the Linux kernel's FQ qdisc.
   using_pacing_ = true;
   send_algorithm_.reset(
       new PacingSender(send_algorithm_.release(),
                        QuicTime::Delta::FromMilliseconds(1),
                        kInitialUnpacedBurst));
 }
 
 }  // namespace net