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

components/variations/service/variations_service.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 "components/variations/service/variations_service.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/build_time.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/task_runner_util.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "base/timer/elapsed_timer.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "build/build_config.h"
 #include "components/data_use_measurement/core/data_use_user_data.h"
 #include "components/metrics/metrics_state_manager.h"
 #include "components/network_time/network_time_tracker.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
@@ skipping 872 matching lines @@
 
   if (got_stored_country && stored_country == country_override)
     return false;
 
   base::Version version(version_info::GetVersionNumber());
   StorePermanentCountry(version, country_override);
   return true;
 }
 
 }  // namespace variations