PART1: Initiated the SignedSettings refactoring.

chrome/browser/ui/webui/options/chromeos/system_settings_provider.h

 // Copyright (c) 2011 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_UI_WEBUI_OPTIONS_CHROMEOS_SYSTEM_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_SYSTEM_SETTINGS_PROVIDER_H_
 
 #include <vector>
 
 #include "base/string16.h"
 #include "chrome/browser/chromeos/cros_settings_provider.h"
 #include "chrome/browser/chromeos/system/timezone_settings.h"
 #include "third_party/icu/public/i18n/unicode/timezone.h"
 
 namespace base {
 class Value;
 class ListValue;
 }
 
 namespace chromeos {
 
 class SystemSettingsProvider : public CrosSettingsProvider,
                                public system::TimezoneSettings::Observer {
  public:
   SystemSettingsProvider();
   virtual ~SystemSettingsProvider();
 
   // CrosSettingsProvider overrides.
-  virtual bool Get(const std::string& path,
-                   base::Value** out_value) const OVERRIDE;
+  virtual const base::Value* Get(const std::string& path) const OVERRIDE;
+  virtual bool GetTrusted(const std::string& path,
+                          const Callback& callback) const OVERRIDE;
   virtual bool HandlesSetting(const std::string& path) const OVERRIDE;
 
+
   // Overridden from TimezoneSettings::Observer:
   virtual void TimezoneChanged(const icu::TimeZone& timezone) OVERRIDE;
 
   // Creates the map of timezones used by the options page.
   base::ListValue* GetTimezoneList();
 
  private:
   // CrosSettingsProvider overrides.
   virtual void DoSet(const std::string& path, base::Value* in_value) OVERRIDE;
 
@@ skipping 17 matching lines @@
 
   // Timezones.
   std::vector<icu::TimeZone*> timezones_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_SYSTEM_SETTINGS_PROVIDER_H_