Minor cleanup of QuicUnackedPacketMap to simplify the implementation of

net/quic/quic_unacked_packet_map.cc

Index: net/quic/quic_unacked_packet_map.cc
diff --git a/net/quic/quic_unacked_packet_map.cc b/net/quic/quic_unacked_packet_map.cc
index c6f09c682cbe86f88c8c907bbb73721eb0b77098..a8fe3b5eb44145f766d6cbda0b92a510e3a4ca2d 100644
--- a/net/quic/quic_unacked_packet_map.cc
+++ b/net/quic/quic_unacked_packet_map.cc
@@ -198,13 +198,7 @@ bool QuicUnackedPacketMap::HasUnackedPackets() const {
 }
 
 bool QuicUnackedPacketMap::HasPendingPackets() const {
-  for (UnackedPacketMap::const_reverse_iterator it =
-           unacked_packets_.rbegin(); it != unacked_packets_.rend(); ++it) {
-    if (it->second.pending) {
-      return true;
-    }
-  }
-  return false;
+  return bytes_in_flight_ > 0;
 }
 
 const TransmissionInfo& QuicUnackedPacketMap::GetTransmissionInfo(
@@ -271,17 +265,6 @@ bool QuicUnackedPacketMap::HasUnackedRetransmittableFrames() const {
   return false;
 }
 
-size_t QuicUnackedPacketMap::GetNumRetransmittablePackets() const {
-  size_t num_unacked_packets = 0;
-  for (UnackedPacketMap::const_iterator it = unacked_packets_.begin();
-       it != unacked_packets_.end(); ++it) {
-    if (it->second.retransmittable_frames != NULL) {
-      ++num_unacked_packets;
-    }
-  }
-  return num_unacked_packets;
-}
-
 QuicPacketSequenceNumber
 QuicUnackedPacketMap::GetLeastUnackedSentPacket() const {
   if (unacked_packets_.empty()) {