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

ios/chrome/browser/signin/signin_client_impl.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/signin/signin_client_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/guid.h"
 #include "base/logging.h"
+#include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/metrics/metrics_service.h"
-#include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_cookie_changed_subscription.h"
 #include "components/signin/core/browser/signin_header_helper.h"
 #include "components/signin/ios/browser/profile_oauth2_token_service_ios_provider.h"
 #include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/browser_state_info_cache.h"
 #include "ios/chrome/browser/content_settings/cookie_settings_factory.h"
 #include "ios/chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ skipping 202 matching lines @@
     callback.Run();
   }
 }
 
 GaiaAuthFetcher* SigninClientImpl::CreateGaiaAuthFetcher(
     GaiaAuthConsumer* consumer,
     const std::string& source,
     net::URLRequestContextGetter* getter) {
   return new GaiaAuthFetcherIOS(consumer, source, getter, browser_state_);
 }