Make GetRootWindow() return a Window instead of a RootWindow.

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

 // Copyright (c) 2012 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/launcher_context_menu.h"
 
 #include <string>
 
 #include "ash/desktop_background/user_wallpaper_delegate.h"
 #include "ash/root_window_controller.h"
@@ skipping 19 matching lines @@
 namespace {
 
 bool MenuItemHasLauncherContext(const extensions::MenuItem* item) {
   return item->contexts().Contains(extensions::MenuItem::LAUNCHER);
 }
 
 }  // namespace
 
 LauncherContextMenu::LauncherContextMenu(ChromeLauncherController* controller,
                                          const ash::LauncherItem* item,
-                                         aura::RootWindow* root)
+                                         aura::Window* root)
     : ui::SimpleMenuModel(NULL),
       controller_(controller),
       item_(*item),
       shelf_alignment_menu_(root),
       root_window_(root) {
   DCHECK(item);
   DCHECK(root_window_);
   Init();
 }
 
 LauncherContextMenu::LauncherContextMenu(ChromeLauncherController* controller,
-                                         aura::RootWindow* root)
+                                         aura::Window* root)
     : ui::SimpleMenuModel(NULL),
       controller_(controller),
       item_(ash::LauncherItem()),
       shelf_alignment_menu_(root),
       extension_items_(new extensions::ContextMenuMatcher(
           controller->profile(), this, this,
           base::Bind(MenuItemHasLauncherContext))),
       root_window_(root) {
   DCHECK(root_window_);
   Init();
@@ skipping 211 matching lines @@
     case MENU_CHANGE_WALLPAPER:
       ash::Shell::GetInstance()->user_wallpaper_delegate()->
           OpenSetWallpaperPage();
       break;
 #endif
     default:
       extension_items_->ExecuteCommand(command_id, NULL,
                                        content::ContextMenuParams());
   }
 }