Change userid from a uint32_t to a string guid

components/mus/ws/test_utils.cc

 // Copyright 2016 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/ws/test_utils.h"
 
 #include "cc/output/copy_output_request.h"
 #include "components/mus/surfaces/surfaces_state.h"
 #include "components/mus/ws/display_binding.h"
 #include "components/mus/ws/window_manager_factory_service.h"
@@ skipping 52 matching lines @@
 
 // WindowManagerFactoryRegistryTestApi ----------------------------------------
 
 WindowManagerFactoryRegistryTestApi::WindowManagerFactoryRegistryTestApi(
     WindowManagerFactoryRegistry* registry)
     : registry_(registry) {}
 
 WindowManagerFactoryRegistryTestApi::~WindowManagerFactoryRegistryTestApi() {}
 
 void WindowManagerFactoryRegistryTestApi::AddService(
-    UserId user_id,
+    const UserId& user_id,
     mojom::WindowManagerFactory* factory) {
   scoped_ptr<WindowManagerFactoryService> service_ptr(
       new WindowManagerFactoryService(registry_, user_id));
   WindowManagerFactoryService* service = service_ptr.get();
   registry_->AddServiceImpl(std::move(service_ptr));
   service->SetWindowManagerFactoryImpl(factory);
 }
 
 // TestPlatformDisplayFactory  -------------------------------------------------
 
@@ skipping 187 matching lines @@
     Display* display =
         new Display(connection_manager_, nullptr, scoped_refptr<GpuState>(),
                     scoped_refptr<mus::SurfacesState>());
     display->Init(nullptr);
   }
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace mus