Implements CR deduplication for iOS.

ios/chrome/browser/component_updater/ios_component_updater_configurator.cc

 // Copyright 2015 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 "ios/chrome/browser/component_updater/ios_component_updater_configurator.h"
 
 #include <string>
 #include <vector>
 
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 136 matching lines @@
 
 scoped_refptr<base::SequencedTaskRunner>
 IOSConfigurator::GetSequencedTaskRunner() const {
   return web::WebThread::GetBlockingPool()
       ->GetSequencedTaskRunnerWithShutdownBehavior(
           web::WebThread::GetBlockingPool()->GetSequenceToken(),
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 }
 
 PrefService* IOSConfigurator::GetPrefService() const {
-  return nullptr;
+  return GetApplicationContext()->GetLocalState();
 }
 
 }  // namespace
 
 scoped_refptr<update_client::Configurator> MakeIOSComponentUpdaterConfigurator(
     const base::CommandLine* cmdline,
     net::URLRequestContextGetter* context_getter) {
   return new IOSConfigurator(cmdline, context_getter);
 }
 
 }  // namespace component_updater