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

ash/launcher/launcher_item_delegate.h

 // 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.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_ITEM_DELEGATE_H_
 #define ASH_LAUNCHER_LAUNCHER_ITEM_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 #include "base/strings/string16.h"
@@ skipping 35 matching lines @@
   // that this was triggered by keyboard action (Alt+<number>) and special
   // handling might happen.
   virtual void ItemSelected(const ui::Event& event) = 0;
 
   // Returns the title to display.
   virtual base::string16 GetTitle() = 0;
 
   // Returns the context menumodel for the specified item on
   // |root_window|.  Return NULL if there should be no context
   // menu. The caller takes ownership of the returned model.
-  virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root_window) = 0;
+  virtual ui::MenuModel* CreateContextMenu(aura::Window* root_window) = 0;
 
   // Returns the application menu model for the specified item. There are three
   // possible return values:
   //  - A return of NULL indicates that no menu is wanted for this item.
   //  - A return of a menu with one item means that only the name of the
   //    application/item was added and there are no active applications.
   //    Note: This is useful for hover menus which also show context help.
   //  - A list containing the title and the active list of items.
   // The caller takes ownership of the returned model.
   // |event_flags| specifies the flags of the event which triggered this menu.
   virtual ash::LauncherMenuModel* CreateApplicationMenu(int event_flags) = 0;
 
   // Whether the launcher item is draggable.
   virtual bool IsDraggable() = 0;
 
   // Returns true if a tooltip should be shown.
   virtual bool ShouldShowTooltip() = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_ITEM_DELEGATE_H_