Convert ConnectToApplication to take a params class

components/mus/public/cpp/lib/window_tree_host_factory.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/public/cpp/window_tree_host_factory.h"
 
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/cpp/window_tree_delegate.h"
 #include "mojo/application/public/cpp/application_impl.h"
 
@@ skipping 14 matching lines @@
                                 tree_client.Pass(), window_manager.Pass());
 }
 
 void CreateSingleWindowTreeHost(
     mojo::ApplicationImpl* app,
     WindowTreeDelegate* delegate,
     mojom::WindowTreeHostPtr* host,
     mojom::WindowManagerPtr window_manager,
     WindowManagerDelegate* window_manager_delegate) {
   mojom::WindowTreeHostFactoryPtr factory;
-  mojo::URLRequestPtr request(mojo::URLRequest::New());
-  request->url = "mojo:mus";
-  app->ConnectToService(request.Pass(), &factory);
+  app->ConnectToService("mojo:mus", &factory);
   CreateWindowTreeHost(factory.get(), mojom::WindowTreeHostClientPtr(),
                        delegate, host, window_manager.Pass(),
                        window_manager_delegate);
 }
 
 }  // namespace mus