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

chrome/browser/ui/ash/launcher/app_shortcut_launcher_item_controller.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/launcher/app_shortcut_launcher_item_controller.h"
 
 #include "apps/ui/native_app_window.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
@@ skipping 191 matching lines @@
       return;
   }
   Activate(ash::LAUNCH_FROM_UNKNOWN);
 }
 
 base::string16 AppShortcutLauncherItemController::GetTitle() {
   return GetAppTitle();
 }
 
 ui::MenuModel* AppShortcutLauncherItemController::CreateContextMenu(
-    aura::RootWindow* root_window) {
+    aura::Window* root_window) {
   ash::LauncherItem item =
       *(launcher_controller()->model()->ItemByID(launcher_id()));
   return new LauncherContextMenu(launcher_controller(), &item, root_window);
 }
 
 ash::LauncherMenuModel*
 AppShortcutLauncherItemController::CreateApplicationMenu(int event_flags) {
   return new LauncherApplicationMenuItemModel(GetApplicationList(event_flags));
 }
 
@@ skipping 126 matching lines @@
 
 bool AppShortcutLauncherItemController::AllowNextLaunchAttempt() {
   if (last_launch_attempt_.is_null() ||
       last_launch_attempt_ + base::TimeDelta::FromMilliseconds(
           kClickSuppressionInMS) < base::Time::Now()) {
     last_launch_attempt_ = base::Time::Now();
     return true;
   }
   return false;
 }