Add RegisterService, split out of Connect().

services/service_manager/tests/connect/connect_test_app.cc

Index: services/service_manager/tests/connect/connect_test_app.cc
diff --git a/services/service_manager/tests/connect/connect_test_app.cc b/services/service_manager/tests/connect/connect_test_app.cc
index 33988a6fac2473065fcaf7f8d979761bc7fcf522..7e3c4e3339a8eb258e94688d52f57028db4592d1 100644
--- a/services/service_manager/tests/connect/connect_test_app.cc
+++ b/services/service_manager/tests/connect/connect_test_app.cc
@@ -172,9 +172,8 @@ class ConnectTestApp : public Service,
   void ConnectToClassAppAsDifferentUser(
       const service_manager::Identity& target,
       const ConnectToClassAppAsDifferentUserCallback& callback) override {
-    Connector::ConnectParams params(target);
     std::unique_ptr<Connection> connection =
-        context()->connector()->Connect(&params);
+        context()->connector()->Connect(target);
     {
       base::RunLoop loop;
       connection->AddConnectionCompletedClosure(base::Bind(&QuitLoop, &loop));