Revert of [Service Manager] Get rid of dynamic service discovery

services/service_manager/background/tests/background_service_manager_unittest.cc

Index: services/service_manager/background/tests/background_service_manager_unittest.cc
diff --git a/services/service_manager/background/tests/background_service_manager_unittest.cc b/services/service_manager/background/tests/background_service_manager_unittest.cc
index f315cd2909968d888080e641547645b838d8f812..ce13f6caf8cd06cb65c0cd79b2acacc8faa28c35 100644
--- a/services/service_manager/background/tests/background_service_manager_unittest.cc
+++ b/services/service_manager/background/tests/background_service_manager_unittest.cc
@@ -53,14 +53,12 @@
 #define MAYBE_Basic Basic
 #endif
 TEST(BackgroundServiceManagerTest, MAYBE_Basic) {
-  BackgroundServiceManager background_service_manager(nullptr, nullptr);
+  BackgroundServiceManager background_service_manager;
   base::MessageLoop message_loop;
-  mojom::ServicePtr service;
-  ServiceContext service_context(base::MakeUnique<ServiceImpl>(),
-                                 mojom::ServiceRequest(&service));
-  background_service_manager.RegisterService(
-      Identity(kTestName, mojom::kRootUserID), std::move(service), nullptr);
-
+  background_service_manager.Init(nullptr);
+  ServiceContext service_context(
+      base::MakeUnique<ServiceImpl>(),
+      background_service_manager.CreateServiceRequest(kTestName));
   mojom::TestServicePtr test_service;
   service_context.connector()->BindInterface(kAppName, &test_service);
   base::RunLoop run_loop;