PART1: Initiated the SignedSettings refactoring.

chrome/browser/chromeos/proxy_cros_settings_provider.h

Index: chrome/browser/chromeos/proxy_cros_settings_provider.h
diff --git a/chrome/browser/chromeos/proxy_cros_settings_provider.h b/chrome/browser/chromeos/proxy_cros_settings_provider.h
index 86801404b56e57580799ea5fbb476466b2140ffc..8e275b739a8f5a56a8fc31accd7a128958210505 100644
--- a/chrome/browser/chromeos/proxy_cros_settings_provider.h
+++ b/chrome/browser/chromeos/proxy_cros_settings_provider.h
@@ -17,7 +17,9 @@ 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 Callback& callback) const OVERRIDE;
   virtual bool HandlesSetting(const std::string& path) const OVERRIDE;
 
   // Set the current network whose proxy settings will be displayed and possibly