Refactoring: Create per-connection packet writers in QuicDispatcher.

net/tools/quic/test_tools/mock_quic_dispatcher.cc

 // Copyright 2013 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.
 
 #include "net/tools/quic/test_tools/mock_quic_dispatcher.h"
 
 #include "net/quic/test_tools/quic_test_utils.h"
 
 namespace net {
 namespace tools {
 namespace test {
 
 MockQuicDispatcher::MockQuicDispatcher(
     const QuicConfig& config,
     const QuicCryptoServerConfig& crypto_config,
+    QuicDispatcher::PacketWriterFactory* packet_writer_factory,
     EpollServer* eps)
     : QuicDispatcher(config,
                      crypto_config,
                      QuicSupportedVersions(),
+                     packet_writer_factory,
                      eps) {}
 
 MockQuicDispatcher::~MockQuicDispatcher() {}
 
 }  // namespace test
 }  // namespace tools
 }  // namespace net