Changes how window manager obtains WindowTree from mus

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 "base/bind.h"
-#include "components/mus/ws/window_manager_factory_registry.h"
-#include "components/mus/ws/window_tree.h"
-
-namespace mus {
-namespace ws {
-
-WindowManagerFactoryService::WindowManagerFactoryService(
-    WindowManagerFactoryRegistry* registry,
-    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);
-  window_manager_factory_ptr_.set_connection_error_handler(base::Bind(
-      &WindowManagerFactoryService::OnConnectionLost, base::Unretained(this)));
-  SetWindowManagerFactoryImpl(window_manager_factory_ptr_.get());
-}
-
-WindowManagerFactoryService::WindowManagerFactoryService(
-    WindowManagerFactoryRegistry* registry,
-    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