Unify the QUIC dispatcher and make the QuicServer work.

net/tools/quic/quic_server.cc

Index: net/tools/quic/quic_server.cc
diff --git a/net/tools/quic/quic_server.cc b/net/tools/quic/quic_server.cc
index 8bc0e81e38f15a4b77741c2d97a7eed8109b4f22..1d8e3c8866b1ea1e6563fddfca6f2d6148553998 100644
--- a/net/tools/quic/quic_server.cc
+++ b/net/tools/quic/quic_server.cc
@@ -183,11 +183,15 @@ bool QuicServer::Listen(const IPEndPoint& address) {
 
   epoll_server_.RegisterFD(fd_, this, kEpollFlags);
   dispatcher_.reset(CreateQuicDispatcher());
-  dispatcher_->Initialize(fd_);
+  dispatcher_->InitializeWithWriter(CreateWriter(fd_));
 
   return true;
 }
 
+QuicDefaultPacketWriter* QuicServer::CreateWriter(int fd) {
+  return new QuicDefaultPacketWriter(fd);
+}
+
 QuicDispatcher* QuicServer::CreateQuicDispatcher() {
   return new QuicDispatcher(
       config_,