Allow injecting a PrefService into ChromeComponentUpdaterConfigurator.

chrome/browser/component_updater/chrome_component_updater_configurator.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "components/update_client/configurator.h"
 
+class PrefService;
+
 namespace base {
 class CommandLine;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace component_updater {
 
 scoped_refptr<update_client::Configurator>
 MakeChromeComponentUpdaterConfigurator(
     const base::CommandLine* cmdline,
-    net::URLRequestContextGetter* context_getter);
+    net::URLRequestContextGetter* context_getter,
+    PrefService* pref_service);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_