Actually use virtual network in OrtcFactory unit test.

webrtc/ortc/ortcfactory_unittest.cc

Index: webrtc/ortc/ortcfactory_unittest.cc
diff --git a/webrtc/ortc/ortcfactory_unittest.cc b/webrtc/ortc/ortcfactory_unittest.cc
index 671cd94466a4ce403cd175f2b1129f66143ebfa6..da1758b70a903338f30aa244ed188f5f5828e80e 100644
--- a/webrtc/ortc/ortcfactory_unittest.cc
+++ b/webrtc/ortc/ortcfactory_unittest.cc
@@ -29,7 +29,7 @@ class OrtcFactoryTest : public testing::Test {
       : thread_(&virtual_socket_server_),
         fake_packet_transport_("fake transport") {
     ortc_factory_ =
-        OrtcFactory::Create(nullptr, nullptr, &fake_network_manager_, nullptr,
+        OrtcFactory::Create(&thread_, nullptr, &fake_network_manager_, nullptr,
                             nullptr,
                             std::unique_ptr<cricket::MediaEngineInterface>(
                                 new cricket::FakeMediaEngine()))