Add missing #include around sequenced_worker_pool.h in //chrome

chrome/browser/supervised_user/supervised_user_site_list.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/supervised_user/supervised_user_site_list.h"
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task_runner_util.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "base/values.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 const int kLegacyWhitelistFormatVersion = 2;
 const int kWhitelistFormatVersion = 1;
 
 const char kEntryPointUrlKey[] = "entry_point_url";
 const char kHostnameHashesKey[] = "hostname_hashes";
 const char kLegacyWhitelistFormatVersionKey[] = "version";
@@ skipping 165 matching lines @@
   base::ListValue* patterns = nullptr;
   dict->GetList(kWhitelistKey, &patterns);
 
   base::ListValue* hostname_hashes = nullptr;
   dict->GetList(kHostnameHashesKey, &hostname_hashes);
 
   callback.Run(make_scoped_refptr(
       new SupervisedUserSiteList(id, title, GURL(entry_point_url),
                                  large_icon_path, patterns, hostname_hashes)));
 }