Revert of Delete base/prefs and update callers to use components.

ios/chrome/browser/browser_state/off_the_record_chrome_browser_state_io_data.mm

 // 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/browser_state/off_the_record_chrome_browser_state_io_data.h"
 
 #import <UIKit/UIkit.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/mac/bind_objc_block.h"
+#include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
 #include "base/threading/worker_pool.h"
 #include "components/net_log/chrome_net_log.h"
-#include "components/prefs/pref_service.h"
 #include "ios/chrome/browser/chrome_constants.h"
 #include "ios/chrome/browser/ios_chrome_io_thread.h"
 #include "ios/chrome/browser/net/cookie_util.h"
 #include "ios/chrome/browser/net/ios_chrome_network_delegate.h"
 #include "ios/chrome/browser/net/ios_chrome_url_request_context_getter.h"
 #include "ios/chrome/browser/pref_names.h"
 #include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/web/public/web_thread.h"
 #include "net/base/sdch_manager.h"
 #include "net/disk_cache/disk_cache.h"
@@ skipping 201 matching lines @@
   NOTREACHED();
   return nullptr;
 }
 
 net::URLRequestContext*
 OffTheRecordChromeBrowserStateIOData::AcquireIsolatedAppRequestContext(
     net::URLRequestContext* main_context) const {
   NOTREACHED();
   return nullptr;
 }