Refactoring: Create per-connection packet writers in QuicDispatcher.

net/quic/test_tools/mock_quic_dispatcher.cc

Index: net/quic/test_tools/mock_quic_dispatcher.cc
diff --git a/net/quic/test_tools/mock_quic_dispatcher.cc b/net/quic/test_tools/mock_quic_dispatcher.cc
index f3f41a5ae10df147682d11e6c477e62b0e5e2a2c..9c9da437d7ddce0347d4258e6dd528490675101c 100644
--- a/net/quic/test_tools/mock_quic_dispatcher.cc
+++ b/net/quic/test_tools/mock_quic_dispatcher.cc
@@ -12,8 +12,13 @@ namespace test {
 MockQuicDispatcher::MockQuicDispatcher(
     const QuicConfig& config,
     const QuicCryptoServerConfig& crypto_config,
+    QuicDispatcher::PacketWriterFactory* packet_writer_factory,
     QuicConnectionHelperInterface* helper)
-    : QuicDispatcher(config, crypto_config, QuicSupportedVersions(), helper) {
+    : QuicDispatcher(config,
+                     crypto_config,
+                     QuicSupportedVersions(),
+                     packet_writer_factory,
+                     helper) {
 }
 
 MockQuicDispatcher::~MockQuicDispatcher() {