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

chrome/browser/chromeos/user_cros_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_CHROMEOS_USER_CROS_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CHROMEOS_USER_CROS_SETTINGS_PROVIDER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 31 matching lines @@
   virtual bool HandlesSetting(const std::string& path) const OVERRIDE;
 
   static void WhitelistUser(const std::string& email);
   static void UnwhitelistUser(const std::string& email);
 
   // Updates cached value of the owner.
   static void UpdateCachedOwner(const std::string& email);
 
  private:
   // CrosSettingsProvider implementation.
-  virtual void DoSet(const std::string& path, base::Value* value) OVERRIDE;
+  virtual void DoSet(const std::string& path,
+                     const base::Value& value) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(UserCrosSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_USER_CROS_SETTINGS_PROVIDER_H_