Revert of Remove header dependencies from sequence_checker.h to sequenced_worker_pool.h

chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.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 "chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.h"
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/launch_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_system.h"
@@ skipping 326 matching lines @@
     const extensions::Extension* imported_module =
         service->GetExtensionById(shared_module.extension_id, true);
     DCHECK(imported_module);
 
     GURL about_page = extensions::ManifestURL::GetAboutPage(imported_module);
     if (about_page != GURL::EmptyGURL())
       license_urls.push_back(about_page);
   }
   return license_urls;
 }