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

ash/wm/base_layout_manager.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 "ash/wm/base_layout_manager.h"
 
 #include "ash/screen_ash.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace/workspace_window_resizer.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/aura_constants.h"
-#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/corewm/corewm_switches.h"
 #include "ui/views/corewm/window_util.h"
 
 namespace ash {
 namespace internal {
 
 /////////////////////////////////////////////////////////////////////////////
 // BaseLayoutManager, public:
 
-BaseLayoutManager::BaseLayoutManager(aura::RootWindow* root_window)
+BaseLayoutManager::BaseLayoutManager(aura::Window* root_window)
     : root_window_(root_window) {
   Shell::GetInstance()->activation_client()->AddObserver(this);
   Shell::GetInstance()->AddShellObserver(this);
   root_window_->AddObserver(this);
 }
 
 BaseLayoutManager::~BaseLayoutManager() {
   if (root_window_)
     root_window_->RemoveObserver(this);
   for (WindowSet::const_iterator i = windows_.begin(); i != windows_.end(); ++i)
@@ skipping 227 matching lines @@
                            ScreenAsh::GetDisplayBoundsInParent(window));
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace internal
 }  // namespace ash