Change userid from a uint32_t to a string guid

components/mus/ws/window_manager_factory_service.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/window_manager_factory_service.h"
 
 #include "components/mus/ws/connection_manager.h"
 #include "components/mus/ws/window_tree.h"
 
 namespace mus {
 namespace ws {
 
 WindowManagerFactoryService::WindowManagerFactoryService(
     WindowManagerFactoryRegistry* registry,
-    UserId user_id,
+    const UserId& user_id,
     mojo::InterfaceRequest<mojom::WindowManagerFactoryService> request)
     : registry_(registry),
       user_id_(user_id),
       binding_(this, std::move(request)),
       window_manager_factory_(nullptr) {}
 
 WindowManagerFactoryService::~WindowManagerFactoryService() {}
 
 void WindowManagerFactoryService::SetWindowManagerFactory(
     mojom::WindowManagerFactoryPtr factory) {
   window_manager_factory_ptr_ = std::move(factory);
   binding_.set_connection_error_handler(base::Bind(
       &WindowManagerFactoryService::OnConnectionLost, base::Unretained(this)));
   SetWindowManagerFactoryImpl(window_manager_factory_ptr_.get());
 }
 
 WindowManagerFactoryService::WindowManagerFactoryService(
     WindowManagerFactoryRegistry* registry,
-    UserId user_id)
+    const UserId& user_id)
     : registry_(registry),
       user_id_(user_id),
       binding_(this),
       window_manager_factory_(nullptr) {}
 
 void WindowManagerFactoryService::SetWindowManagerFactoryImpl(
     mojom::WindowManagerFactory* factory) {
   DCHECK(!window_manager_factory_);
   window_manager_factory_ = factory;
   registry_->OnWindowManagerFactorySet(this);
 }
 
 void WindowManagerFactoryService::OnConnectionLost() {
   registry_->OnWindowManagerFactoryConnectionLost(this);
 }
 
 }  // namespace ws
 }  // namespace mus