Moves maintaining root_window_for_new_windows_ to Shell

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc

 // Copyright 2013 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 "chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.h"
 
 #include <stddef.h>
 
 #include "ash/common/shelf/app_list_button.h"
 #include "ash/common/shelf/shelf_button.h"
@@ skipping 354 matching lines @@
     DCHECK_GE(index, 0);
     ash::ShelfItem item = model_->items()[index];
     ash::WmShelf* shelf =
         ash::WmShelf::ForWindow(ash::WmWindow::Get(CurrentContext()));
     std::unique_ptr<LauncherContextMenu> menu(
         LauncherContextMenu::Create(controller_, &item, shelf));
     return menu;
   }
 
   aura::Window* CurrentContext() {
-    aura::Window* root_window = ash::Shell::GetTargetRootWindow();
+    aura::Window* root_window = ash::Shell::GetRootWindowForNewWindows();
     DCHECK(root_window);
     return root_window;
   }
 
   bool IsItemPresentInMenu(LauncherContextMenu* menu, int command_id) {
     return menu->GetIndexOfCommandId(command_id) != -1;
   }
 
   ash::WmShelf* shelf_;
   ash::ShelfModel* model_;
@@ skipping 2006 matching lines @@
 
   // Close all windows via the menu item.
   CloseBrowserWindow(browser(), menu1.get(), LauncherContextMenu::MENU_CLOSE);
   EXPECT_EQ(0u, BrowserList::GetInstance()->size());
 
   // Check if "Close" is removed from the context menu.
   std::unique_ptr<LauncherContextMenu> menu2 = CreateBrowserItemContextMenu();
   ASSERT_FALSE(
       IsItemPresentInMenu(menu2.get(), LauncherContextMenu::MENU_CLOSE));
 }