Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

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:
+  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);
+ protected:
+  // Only use ChromePrefServiceFactory to create initialized PrefServiceSimple
+  // objects.
+  PrefServiceSimple();

[Mattias Nissler (ping if slow), 2012/12/21 13:09:31]

still needs a virtual dtor (I thought there was agreement on chromium-dev to put
it for better-safe-than-sorry reasons even in subclasses?)

[Jói, 2012/12/21 14:34:13]

Done.

+
+  // Constructs objects.
+  friend class ChromePrefServiceFactory;
+  friend class PrefServiceMockBuilder;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PrefServiceSimple);
+};
+
+#endif  // CHROME_BROWSER_PREFS_PREF_SERVICE_SIMPLE_H_