chrome: Cleanup class/struct forward declarations

chrome/browser/component_updater/sw_reporter_installer_win.h

 // Copyright (c) 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_SW_REPORTER_INSTALLER_WIN_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_SW_REPORTER_INSTALLER_WIN_H_
 
 #include <stdint.h>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "chrome/browser/safe_browsing/srt_fetcher_win.h"
 #include "components/component_updater/default_component_installer.h"
 
 class PrefRegistrySimple;
-class PrefService;
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 class Version;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
@@ skipping 58 matching lines @@
 // Register local state preferences related to the SwReporter.
 void RegisterPrefsForSwReporter(PrefRegistrySimple* registry);
 
 // Register profile preferences related to the SwReporter.
 void RegisterProfilePrefsForSwReporter(
     user_prefs::PrefRegistrySyncable* registry);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_SW_REPORTER_INSTALLER_WIN_H_