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

chrome/browser/chromeos/display/overscan_calibrator.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/chromeos/display/overscan_calibrator.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
@@ skipping 55 matching lines @@
       initial_insets_(initial_insets),
       committed_(false) {
   // Undo the overscan calibration temporarily so that the user can see
   // dark boundary and current overscan region.
   ash::Shell::GetInstance()->display_controller()->SetOverscanInsets(
       display_.id(), gfx::Insets());
 
   ash::internal::DisplayInfo info = ash::Shell::GetInstance()->
       display_manager()->GetDisplayInfo(display_.id());
 
-  aura::RootWindow* root = ash::Shell::GetInstance()->display_controller()->
+  aura::Window* root = ash::Shell::GetInstance()->display_controller()->
       GetRootWindowForDisplayId(display_.id());
   ui::Layer* parent_layer = ash::Shell::GetContainer(
       root, ash::internal::kShellWindowId_OverlayContainer)->layer();
 
   calibration_layer_.reset(new ui::Layer());
   calibration_layer_->SetOpacity(0.5f);
   calibration_layer_->SetBounds(parent_layer->bounds());
   calibration_layer_->set_delegate(this);
   parent_layer->Add(calibration_layer_.get());
 }
@@ skipping 48 matching lines @@
     float device_scale_factor) {
   // TODO(mukai): Cancel the overscan calibration when the device
   // configuration has changed.
 }
 
 base::Closure OverscanCalibrator::PrepareForLayerBoundsChange() {
   return base::Closure();
 }
 
 }  // namespace chromeos