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

chrome/browser/ui/ash/chrome_shell_delegate.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/ui/ash/chrome_shell_delegate.h"
 
 #include "apps/shell_window.h"
 #include "apps/shell_window_registry.h"
 #include "apps/ui/native_app_window.h"
 #include "ash/host/root_window_host_factory.h"
@@ skipping 400 matching lines @@
       content::RecordAction(
           content::UserMetricsAction("WindowSelector_Overview"));
       break;
     case ash::UMA_WINDOW_SELECTION:
       content::RecordAction(
           content::UserMetricsAction("WindowSelector_Selection"));
       break;
   }
 }
 
-ui::MenuModel* ChromeShellDelegate::CreateContextMenu(aura::RootWindow* root) {
+ui::MenuModel* ChromeShellDelegate::CreateContextMenu(aura::Window* root) {
   DCHECK(launcher_delegate_);
   // Don't show context menu for exclusive app runtime mode.
   if (chrome::IsRunningInAppMode())
     return NULL;
 
   return new LauncherContextMenu(launcher_delegate_, root);
 }
 
 ash::RootWindowHostFactory* ChromeShellDelegate::CreateRootWindowHostFactory() {
   return ash::RootWindowHostFactory::Create();
@@ skipping 13 matching lines @@
 }
 
 Browser* ChromeShellDelegate::GetTargetBrowserIfAvailable() {
   return chrome::FindBrowserWithWindow(ash::wm::GetActiveWindow());
 }
 
 keyboard::KeyboardControllerProxy*
     ChromeShellDelegate::CreateKeyboardControllerProxy() {
   return new AshKeyboardControllerProxy();
 }