Optimize QuicUnackedPacketMap by changing from a LinkedHashMap to a

net/quic/quic_sent_packet_manager.h

Index: net/quic/quic_sent_packet_manager.h
diff --git a/net/quic/quic_sent_packet_manager.h b/net/quic/quic_sent_packet_manager.h
index 06d381fdb2f699fd98fb0664042f316cf100a6d7..265a6b378efd9417da9ea48982a5b1c87fabd92e 100644
--- a/net/quic/quic_sent_packet_manager.h
+++ b/net/quic/quic_sent_packet_manager.h
@@ -5,10 +5,7 @@
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
-#include <deque>
-#include <list>
 #include <map>
-#include <queue>
 #include <set>
 #include <utility>
 #include <vector>
@@ -318,9 +315,9 @@ class NET_EXPORT_PRIVATE QuicSentPacketManager {
   // Removes the retransmittability and pending properties from the packet at
   // |it| due to receipt by the peer.  Returns an iterator to the next remaining
   // unacked packet.
-  QuicUnackedPacketMap::const_iterator MarkPacketHandled(
-      QuicUnackedPacketMap::const_iterator it,
-      QuicTime::Delta delta_largest_observed);
+  void MarkPacketHandled(QuicPacketSequenceNumber sequence_number,
+                         const TransmissionInfo& info,
+                         QuicTime::Delta delta_largest_observed);
 
   // Request that |sequence_number| be retransmitted after the other pending
   // retransmissions.  Does not add it to the retransmissions if it's already