Move AppWindow to extensions

athena/content/shell/content_activity_factory.cc

 // Copyright 2014 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 "athena/content/content_activity_factory.h"
 
 #include "athena/content/shell/shell_app_activity.h"
 
 namespace athena {
 
 Activity* ContentActivityFactory::CreateAppActivity(
     extensions::ShellAppWindow* app_window,
     const std::string& app_id) {
   return new ShellAppActivity(app_window, app_id);
 }
 
 Activity* ContentActivityFactory::CreateAppActivity(
-    apps::AppWindow* app_window) {
+    extensions::AppWindow* app_window) {
   return NULL;
 }
 
 }  // namespace athena