Minor optimizations to QuicUnackedPacketMap and QuicSentPacketManager to

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 d7f0a6060b5b1620b8a410893b135b7e516f163b..ad83057217a17e8f2f3ab7caa674a890c66d30e6 100644
--- a/net/quic/quic_sent_packet_manager.cc
+++ b/net/quic/quic_sent_packet_manager.cc
@@ -513,12 +513,12 @@ QuicSentPacketManager::RetransmissionTimeoutMode
 
 void QuicSentPacketManager::OnPacketAbandoned(
     QuicPacketSequenceNumber sequence_number) {
-  if (unacked_packets_.IsPending(sequence_number)) {
-    LOG_IF(DFATAL, unacked_packets_.GetTransmissionInfo(
-        sequence_number).bytes_sent == 0);
-    send_algorithm_->OnPacketAbandoned(
-        sequence_number,
-        unacked_packets_.GetTransmissionInfo(sequence_number).bytes_sent);
+  const QuicUnackedPacketMap::TransmissionInfo& transmission_info =
+      unacked_packets_.GetTransmissionInfo(sequence_number);
+  if (transmission_info.pending) {
+    LOG_IF(DFATAL, transmission_info.bytes_sent == 0);
+    send_algorithm_->OnPacketAbandoned(sequence_number,
+                                       transmission_info.bytes_sent);
     unacked_packets_.SetNotPending(sequence_number);
   }
 }