Unify the QUIC dispatcher and make the QuicServer work.

net/tools/quic/quic_dispatcher_test.cc

Index: net/tools/quic/quic_dispatcher_test.cc
diff --git a/net/tools/quic/quic_dispatcher_test.cc b/net/tools/quic/quic_dispatcher_test.cc
index 8046608e29b5a236b3d24be6a6dc09355a4076fa..57f21d8748222355ddc1b23b9a990e1fc7281c5a 100644
--- a/net/tools/quic/quic_dispatcher_test.cc
+++ b/net/tools/quic/quic_dispatcher_test.cc
@@ -125,7 +125,7 @@ class QuicDispatcherTest : public ::testing::Test {
         time_wait_list_manager_(nullptr),
         session1_(nullptr),
         session2_(nullptr) {
-    dispatcher_.Initialize(1);
+    dispatcher_.InitializeWithWriter(new QuicDefaultPacketWriter(1));
   }
 
   ~QuicDispatcherTest() override {}