Rename QUIC's TransmissionInfo pending to in_flight and the associated

net/quic/congestion_control/tcp_loss_algorithm.cc

Index: net/quic/congestion_control/tcp_loss_algorithm.cc
diff --git a/net/quic/congestion_control/tcp_loss_algorithm.cc b/net/quic/congestion_control/tcp_loss_algorithm.cc
index 70198d6fe5f1b5a4123b48dd1f140fa395d267a5..8dad3f18429279d8401424d3c727657b9767401a 100644
--- a/net/quic/congestion_control/tcp_loss_algorithm.cc
+++ b/net/quic/congestion_control/tcp_loss_algorithm.cc
@@ -40,7 +40,7 @@ SequenceNumberSet TCPLossAlgorithm::DetectLostPackets(
 
   for (QuicUnackedPacketMap::const_iterator it = unacked_packets.begin();
        it != unacked_packets.end() && it->first <= largest_observed; ++it) {
-    if (!it->second.pending) {
+    if (!it->second.in_flight) {
       continue;
     }
 
@@ -52,7 +52,7 @@ SequenceNumberSet TCPLossAlgorithm::DetectLostPackets(
     }
 
     // Only early retransmit(RFC5827) when the last packet gets acked and
-    // there are pending retransmittable packets.
+    // there are retransmittable packets in flight.
     // This also implements a timer-protected variant of FACK.
     if (it->second.retransmittable_frames &&
         unacked_packets.largest_sent_packet() == largest_observed) {