PART1: Initiated the SignedSettings refactoring.

chrome/browser/chromeos/proxy_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_PROXY_CROS_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CHROMEOS_PROXY_CROS_SETTINGS_PROVIDER_H_
 #pragma once
 
+#include "base/callback.h"
 #include "base/memory/singleton.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/cros_settings_provider.h"
 #include "chrome/browser/chromeos/proxy_config_service_impl.h"
 
 namespace chromeos {
 
 class ProxyCrosSettingsProvider : public CrosSettingsProvider {
  public:
   ProxyCrosSettingsProvider();
+
   // CrosSettingsProvider implementation.
-  virtual bool Get(const std::string& path, Value** out_value) const OVERRIDE;
+  virtual const base::Value* Get(const std::string& path) const OVERRIDE;
+  virtual bool GetTrusted(const std::string& path,
+                          const base::Closure& callback) const OVERRIDE;
   virtual bool HandlesSetting(const std::string& path) const OVERRIDE;
 
   // Set the current network whose proxy settings will be displayed and possibly
   // edited on.
   void SetCurrentNetwork(const std::string& network);
 
   // Make the active network the current one whose proxy settings will be
   // displayed and possibly edited on.
   void MakeActiveNetworkCurrent();
 
@@ skipping 25 matching lines @@
 
   Value* CreateServerPortValue(
       const ProxyConfigServiceImpl::ProxyConfig::ManualProxy& proxy) const;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyCrosSettingsProvider);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PROXY_CROS_SETTINGS_PROVIDER_H_