PART2: Make SignedSettings use proper Value types instead of string all around the place.

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/callback.h"
@@ skipping 23 matching lines @@
   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;
+  virtual void DoSet(const std::string& path,
+                     const base::Value& in_value) OVERRIDE;
 
   // Gets timezone name.
   static string16 GetTimezoneName(const icu::TimeZone& timezone);
 
   // Gets timezone ID which is also used as timezone pref value.
   static string16 GetTimezoneID(const icu::TimeZone& timezone);
 
   // Gets timezone object from its id.
   const icu::TimeZone* GetTimezone(const string16& timezone_id);
 
@@ skipping 10 matching lines @@
   std::vector<icu::TimeZone*> timezones_;
   // TODO(pastarmovj): This will be cached into the local_store soon.
   mutable scoped_ptr<base::StringValue> system_timezone_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CHROMEOS_SYSTEM_SETTINGS_PROVIDER_H_