Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/prefs/chrome_pref_service_builder.h

-// Copyright (c) 2012 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_PREFS_CHROME_PREF_SERVICE_BUILDER_H_
-#define CHROME_BROWSER_PREFS_CHROME_PREF_SERVICE_BUILDER_H_
-
-#include "chrome/browser/prefs/pref_service_builder.h"
-
-namespace policy {
-class PolicyService;
-}
-
-class PrefStore;
-
-class ChromePrefServiceBuilder : public PrefServiceBuilder {
- public:
-  ChromePrefServiceBuilder();
-  virtual ~ChromePrefServiceBuilder();
-
-  // Factory method that creates a new instance of a PrefService for
-  // Chrome with the applicable PrefStores. The |pref_filename| points
-  // to the user preference file. This is the usual way to create a
-  // new PrefService.
-  // |extension_pref_store| is used as the source for extension-controlled
-  // preferences and may be NULL.
-  // |policy_service| is used as the source for mandatory or recommended
-  // policies.
-  // The PrefService takes ownership of |extension_pref_store|.
-  // If |async| is true, asynchronous version is used.
-  // Notifies using PREF_INITIALIZATION_COMPLETED in the end. Details is set to
-  // the created PrefService or NULL if creation has failed. Note, it is
-  // guaranteed that in asynchronous version initialization happens after this
-  // function returned.
-  PrefService* CreateChromePrefs(
-      const FilePath& pref_filename,
-      base::SequencedTaskRunner* pref_io_task_runner,
-      policy::PolicyService* policy_service,
-      PrefStore* extension_prefs,
-      bool async);
-
- private:
-  void ResetDefaultState();
-
-  DISALLOW_COPY_AND_ASSIGN(ChromePrefServiceBuilder);
-};
-
-#endif  // CHROME_BROWSER_PREFS_CHROME_PREF_SERVICE_BUILDER_H_