Removes a couple more functions from WmWindow

chrome/browser/ui/ash/app_list/app_list_interactive_uitest.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 <memory>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shelf/app_list_button.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm_window.h"
 #include "base/run_loop.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "ui/app_list/presenter/app_list.h"
+#include "ui/aura/window.h"
 #include "ui/events/test/event_generator.h"
 
 using AppListTest = InProcessBrowserTest;
 
 // An integration test to toggle the app list by pressing the shelf button.
 IN_PROC_BROWSER_TEST_F(AppListTest, PressAppListButtonToShowAndDismiss) {
   ash::WmShelf* shelf =
       ash::WmShelf::ForWindow(ash::WmWindow::Get(ash::wm::GetActiveWindow()));
   ash::ShelfWidget* shelf_widget = shelf->shelf_widget();
   ash::AppListButton* app_list_button = shelf_widget->GetAppListButton();
 
-  ash::WmWindow* root_window =
-      ash::WmWindow::Get(ash::wm::GetActiveWindow())->GetRootWindow();
-  ash::WmWindow* app_list_container = root_window->GetChildByShellWindowId(
-      ash::kShellWindowId_AppListContainer);
+  aura::Window* root_window = ash::WmWindow::Get(ash::wm::GetActiveWindow())

[msw, 2017/04/12 22:12:50]

nit: avoid WmWindow roundabout here?

[sky, 2017/04/12 22:35:04]

Done.

+                                  ->GetRootWindow()
+                                  ->aura_window();
+  aura::Window* app_list_container =
+      root_window->GetChildById(ash::kShellWindowId_AppListContainer);
   ui::test::EventGenerator generator(shelf_widget->GetNativeWindow());
 
   // Click the app list button to show the app list.
   ash::Shell* shell = ash::Shell::Get();
   EXPECT_FALSE(shell->app_list()->GetTargetVisibility());
-  EXPECT_EQ(0u, app_list_container->GetChildren().size());
+  EXPECT_EQ(0u, app_list_container->children().size());
   EXPECT_FALSE(app_list_button->is_showing_app_list());
   generator.set_current_location(
       app_list_button->GetBoundsInScreen().CenterPoint());
   generator.ClickLeftButton();
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(shell->app_list()->GetTargetVisibility());
-  EXPECT_EQ(1u, app_list_container->GetChildren().size());
+  EXPECT_EQ(1u, app_list_container->children().size());
   EXPECT_TRUE(app_list_button->is_showing_app_list());
 
   // Click the button again to dismiss the app list; the window animates closed.
   generator.ClickLeftButton();
   base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(shell->app_list()->GetTargetVisibility());
-  EXPECT_EQ(1u, app_list_container->GetChildren().size());
+  EXPECT_EQ(1u, app_list_container->children().size());
   EXPECT_FALSE(app_list_button->is_showing_app_list());
 }