Remove unused base/threading/worker_pool.h includes.

chrome/browser/ui/webui/chromeos/login/network_screen_handler.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/webui/chromeos/login/network_screen_handler.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_runner_util.h"
-#include "base/threading/worker_pool.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #include "chrome/browser/chromeos/customization/customization_document.h"
 #include "chrome/browser/chromeos/idle_detector.h"
 #include "chrome/browser/chromeos/login/screens/core_oobe_view.h"
 #include "chrome/browser/chromeos/login/screens/network_screen.h"
 #include "chrome/browser/chromeos/login/ui/input_events_blocker.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.h"
@@ skipping 260 matching lines @@
     timezone_option->SetString("value", timezone_id);
     timezone_option->SetString("title", timezone_name);
     timezone_option->SetBoolean("selected", timezone_id == current_timezone_id);
     timezone_list->Append(std::move(timezone_option));
   }
 
   return timezone_list;
 }
 
 }  // namespace chromeos