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

ios/chrome/browser/data_reduction_proxy/ios_chrome_data_reduction_proxy_settings.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/data_reduction_proxy/ios_chrome_data_reduction_proxy_settings.h"
 
 #include <string>
 #include <utility>
 
 #include "base/base64.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram_macros.h"
+#include "base/prefs/pref_service.h"
+#include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/core/browser/data_store.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
-#include "components/prefs/pref_service.h"
-#include "components/prefs/scoped_user_pref_update.h"
 #include "components/proxy_config/proxy_config_pref_names.h"
 #include "components/proxy_config/proxy_prefs.h"
 #include "ios/chrome/browser/metrics/ios_chrome_metrics_service_accessor.h"
 #include "ios/chrome/browser/pref_names.h"
 #include "net/base/host_port_pair.h"
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_list.h"
 #include "net/proxy/proxy_server.h"
 #include "net/url_request/url_request_context_getter.h"
 
@@ skipping 169 matching lines @@
       SetCallbackToRegisterSyntheticFieldTrial(base::Bind(
           &IOSChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial));
   // TODO(bengr): Remove after M46. See http://crbug.com/445599.
   MigrateDataReductionProxyOffProxyPrefs(profile_prefs);
 }
 
 // static
 data_reduction_proxy::Client IOSChromeDataReductionProxySettings::GetClient() {
   return data_reduction_proxy::Client::CHROME_IOS;
 }