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

ash/wm/app_list_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 ASH_WM_APP_LIST_CONTROLLER_H_
 #define ASH_WM_APP_LIST_CONTROLLER_H_
 
 #include "ash/launcher/launcher_icon_observer.h"
 #include "ash/shell_observer.h"
 #include "base/basictypes.h"
@@ skipping 93 matching lines @@
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) OVERRIDE;
 
   // ui::ImplicitAnimationObserver overrides:
   virtual void OnImplicitAnimationsCompleted() OVERRIDE;
 
   // views::WidgetObserver overrides:
   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
 
   // ShellObserver overrides:
-  virtual void OnShelfAlignmentChanged(aura::RootWindow* root_window) OVERRIDE;
+  virtual void OnShelfAlignmentChanged(aura::Window* root_window) OVERRIDE;
 
   // LauncherIconObserver overrides:
   virtual void OnLauncherIconPositionsChanged() OVERRIDE;
 
   // app_list::PaginationModelObserver overrides:
   virtual void TotalPagesChanged() OVERRIDE;
   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
   virtual void TransitionStarted() OVERRIDE;
   virtual void TransitionChanged() OVERRIDE;
 
@@ skipping 11 matching lines @@
   // Whether should schedule snap back animation.
   bool should_snap_back_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_APP_LIST_CONTROLLER_H_