Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/prefs/pref_service_simple.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_PREF_SERVICE_SIMPLE_H_
-#define CHROME_BROWSER_PREFS_PREF_SERVICE_SIMPLE_H_
-
-#include "chrome/browser/prefs/pref_service.h"
-
-// A simple PrefService implementation.
-class PrefServiceSimple : public PrefService {
- public:
-  // You may wish to use PrefServiceBuilder or one of its subclasses
-  // for simplified construction.
-  PrefServiceSimple(
-      PrefNotifierImpl* pref_notifier,
-      PrefValueStore* pref_value_store,
-      PersistentPrefStore* user_prefs,
-      DefaultPrefStore* default_store,
-      base::Callback<void(PersistentPrefStore::PrefReadError)>
-          read_error_callback,
-      bool async);
-  virtual ~PrefServiceSimple();
-
-  void RegisterBooleanPref(const char* path, bool default_value);
-  void RegisterIntegerPref(const char* path, int default_value);
-  void RegisterDoublePref(const char* path, double default_value);
-  void RegisterStringPref(const char* path, const std::string& default_value);
-  void RegisterFilePathPref(const char* path, const FilePath& default_value);
-  void RegisterListPref(const char* path);
-  void RegisterDictionaryPref(const char* path);
-  void RegisterListPref(const char* path, base::ListValue* default_value);
-  void RegisterDictionaryPref(
-      const char* path, base::DictionaryValue* default_value);
-  void RegisterInt64Pref(const char* path,
-                         int64 default_value);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PrefServiceSimple);
-};
-
-#endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_SIMPLE_H_