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

chrome/browser/ui/ash/launcher/shell_window_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/shell_window_launcher_item_controller.h"
 
 #include "apps/shell_window.h"
 #include "apps/ui/native_app_window.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/wm/window_state.h"
@@ skipping 211 matching lines @@
     if (shell_window->web_contents()) {
       string16 title = shell_window->web_contents()->GetTitle();
       if (!title.empty())
         return title;
     }
   }
   return GetAppTitle();
 }
 
 ui::MenuModel* ShellWindowLauncherItemController::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*
 ShellWindowLauncherItemController::CreateApplicationMenu(int event_flags) {
   return new LauncherApplicationMenuItemModel(GetApplicationList(event_flags));
 }
 
@@ skipping 48 matching lines @@
   }
   if (window_to_show->GetBaseWindow()->IsActive()) {
     // Coming here, only a single window is active. For keyboard activations
     // the window gets animated.
     AnimateWindow(window_to_show->GetNativeWindow(),
                   views::corewm::WINDOW_ANIMATION_TYPE_BOUNCE);
   } else {
     ShowAndActivateOrMinimize(window_to_show);
   }
 }