Update from https://crrev.com/316786

net/quic/quic_ack_notifier.cc

Index: net/quic/quic_ack_notifier.cc
diff --git a/net/quic/quic_ack_notifier.cc b/net/quic/quic_ack_notifier.cc
index b399a61bcc173541f22d65d49fe653caa6baa023..48ee23df1a45bac5c7ce4876489feb930fabfc36 100644
--- a/net/quic/quic_ack_notifier.cc
+++ b/net/quic/quic_ack_notifier.cc
@@ -29,21 +29,18 @@ QuicAckNotifier::QuicAckNotifier(DelegateInterface* delegate)
 QuicAckNotifier::~QuicAckNotifier() {
 }
 
-void QuicAckNotifier::AddSequenceNumber(
-    const QuicPacketSequenceNumber& sequence_number,
-    int packet_payload_size) {
+void QuicAckNotifier::OnSerializedPacket() {
   ++unacked_packets_;
-  DVLOG(1) << "AckNotifier waiting for packet: " << sequence_number;
 }
 
-bool QuicAckNotifier::OnAck(QuicPacketSequenceNumber sequence_number,
-                            QuicTime::Delta delta_largest_observed) {
+bool QuicAckNotifier::OnAck(QuicTime::Delta delta_largest_observed) {
   if (unacked_packets_ <= 0) {
-    LOG(DFATAL) << "Acked more packets than were tracked.";
+    LOG(DFATAL) << "Acked more packets than were tracked."
+                << " unacked_packets:" << unacked_packets_;
     return true;
   }
   --unacked_packets_;
-  if (IsEmpty()) {
+  if (!HasUnackedPackets()) {
     // We have seen all the sequence numbers we were waiting for, trigger
     // callback notification.
     delegate_->OnAckNotification(retransmitted_packet_count_,
@@ -54,6 +51,16 @@ bool QuicAckNotifier::OnAck(QuicPacketSequenceNumber sequence_number,
   return false;
 }
 
+bool QuicAckNotifier::OnPacketAbandoned() {
+  if (unacked_packets_ <= 0) {
+    LOG(DFATAL) << "Abandoned more packets than were tracked."
+                << " unacked_packets:" << unacked_packets_;
+    return true;
+  }
+  --unacked_packets_;
+  return unacked_packets_ == 0;
+}
+
 void QuicAckNotifier::OnPacketRetransmitted(int packet_payload_size) {
   ++retransmitted_packet_count_;
   retransmitted_byte_count_ += packet_payload_size;