Test tools for udp proxying. This involves a few refactors of test

net/tools/quic/end_to_end_test.cc

Index: net/tools/quic/end_to_end_test.cc
diff --git a/net/tools/quic/end_to_end_test.cc b/net/tools/quic/end_to_end_test.cc
index 25779259714f4383c0fc894ef25c34055b8444a5..d6882697850a9a78220fd56acb3047d3a136e222 100644
--- a/net/tools/quic/end_to_end_test.cc
+++ b/net/tools/quic/end_to_end_test.cc
@@ -250,10 +250,10 @@ class EndToEndTest : public ::testing::TestWithParam<TestParams> {
 
   void StartServer() {
     server_thread_.reset(
-        new ServerThread(server_address_,
-                         server_config_,
-                         server_supported_versions_,
-                         strike_register_no_startup_period_));
+        new ServerThread(
+            new QuicServer(server_config_, server_supported_versions_),
+            server_address_,
+            strike_register_no_startup_period_));
     server_thread_->Initialize();
     server_address_ = IPEndPoint(server_address_.address(),
                                  server_thread_->GetPort());