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

chrome/browser/ui/ash/launcher/shell_window_launcher_item_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_LAUNCHER_SHELL_WINDOW_LAUNCHER_ITEM_CONTROLLER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_SHELL_WINDOW_LAUNCHER_ITEM_CONTROLLER_H_
 
 #include <list>
 #include <string>
 
@@ skipping 48 matching lines @@
   virtual bool IsOpen() const OVERRIDE;
   virtual bool IsVisible() const OVERRIDE;
   virtual void Launch(ash::LaunchSource source, int event_flags) OVERRIDE;
   virtual void Activate(ash::LaunchSource source) OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual ChromeLauncherAppMenuItems GetApplicationList(
       int event_flags) OVERRIDE;
   virtual void ItemSelected(const ui::Event& eent) OVERRIDE;
   virtual base::string16 GetTitle() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(
-      aura::RootWindow* root_window) OVERRIDE;
+      aura::Window* root_window) OVERRIDE;
   virtual ash::LauncherMenuModel* CreateApplicationMenu(
       int event_flags) OVERRIDE;
   virtual bool IsDraggable() OVERRIDE;
   virtual bool ShouldShowTooltip() OVERRIDE;
 
   // aura::WindowObserver overrides:
   virtual void OnWindowPropertyChanged(aura::Window* window,
                                        const void* key,
                                        intptr_t old) OVERRIDE;
 
@@ skipping 22 matching lines @@
   // AppLauncherItemController for each |app_launcher_id_|.
   const std::string app_launcher_id_;
 
   // Scoped list of observed windows (for removal on destruction)
   ScopedObserver<aura::Window, aura::WindowObserver> observed_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellWindowLauncherItemController);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_SHELL_WINDOW_LAUNCHER_ITEM_CONTROLLER_H_