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

ash/magnifier/partial_magnification_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_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
 #define ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_
 
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/point.h"
@@ skipping 31 matching lines @@
   float GetScale() const { return scale_; }
 
  private:
   void OnMouseMove(const gfx::Point& location_in_root);
 
   // Switch PartialMagnified RootWindow to |new_root_window|. This does
   // following:
   //  - Remove the magnifier from the current root window.
   //  - Create a magnifier in the new root_window |new_root_window|.
   //  - Switch the target window from current window to |new_root_window|.
-  void SwitchTargetRootWindow(aura::RootWindow* new_root_window);
+  void SwitchTargetRootWindow(aura::Window* new_root_window);
 
   // Returns the root window that contains the mouse cursor.
   aura::RootWindow* GetCurrentRootWindow();
 
   // Return true if the magnification scale > kMinPartialMagnifiedScaleThreshold
   bool IsPartialMagnified() const;
 
   // Create the magnifier window.
   void CreateMagnifierWindow();
 
@@ skipping 23 matching lines @@
   gfx::Point origin_;
 
   views::Widget* zoom_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(PartialMagnificationController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_MAGNIFIER_PARTIAL_MAGNIFICATION_CONTROLLER_H_