use std::unordered_map and std::unordered_set in QUIC code instead of

net/quic/quic_packet_creator.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Accumulates frames for the next packet until more frames no longer fit or
 // it's time to create a packet from them.  Also provides packet creation of
 // FEC packets based on previously created packets. If multipath enabled, only
 // creates packets on one path at the same time. Currently, next packet number
 // is tracked per-path.
 
 #ifndef NET_QUIC_QUIC_PACKET_CREATOR_H_
 #define NET_QUIC_QUIC_PACKET_CREATOR_H_
 
 #include <stddef.h>
 
 #include <string>
+#include <unordered_map>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "net/quic/quic_fec_group.h"
 #include "net/quic/quic_framer.h"
 #include "net/quic/quic_protocol.h"
 
@@ skipping 355 matching lines @@
   // packet_size should never be read directly, use PacketSize() instead.
   // TODO(ianswett): Move packet_size_ into SerializedPacket once
   // QuicEncryptedPacket has been flattened into SerializedPacket.
   size_t packet_size_;
   QuicConnectionId connection_id_;
 
   // Packet used to invoke OnSerializedPacket.
   SerializedPacket packet_;
 
   // Map mapping path_id to last sent packet number on the path.
-  hash_map<QuicPathId, QuicPacketNumber> multipath_packet_number_;
+  std::unordered_map<QuicPathId, QuicPacketNumber> multipath_packet_number_;
 
   // FEC related fields.
   // True when creator is requested to turn on FEC protection. False otherwise.
   // There is a time difference between should_fec_protect_next_packet_ is
   // true/false and FEC is actually turned on/off (e.g., The creator may have an
   // open FEC group even if this variable is false).
   bool should_fec_protect_next_packet_;
   // If true, any created packets will be FEC protected.
   // TODO(fayang): Combine should_fec_protect_next_packet and fec_protect_ to
   // one variable.
   bool fec_protect_;
   scoped_ptr<QuicFecGroup> fec_group_;
   // 0 indicates FEC is disabled.
   size_t max_packets_per_fec_group_;
   // FEC policy that specifies when to send FEC packet.
   FecSendPolicy fec_send_policy_;
   // Timeout used for FEC alarm. Can be set to zero initially or if the SRTT has
   // not yet been set.
   QuicTime::Delta fec_timeout_;
   // The multiplication factor for FEC timeout based on RTT.
   // TODO(rtenneti): Delete this code after the 0.25 RTT FEC experiment.
   float rtt_multiplier_for_fec_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketCreator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PACKET_CREATOR_H_