PART1: Initiated the SignedSettings refactoring.

chrome/browser/chromeos/user_cros_settings_provider.h

Index: chrome/browser/chromeos/user_cros_settings_provider.h
diff --git a/chrome/browser/chromeos/user_cros_settings_provider.h b/chrome/browser/chromeos/user_cros_settings_provider.h
index 0aa70a99a10dbcd90f9565cdca1d21219829273c..2a57268d45c9105c763101608fa6d20f829392d7 100644
--- a/chrome/browser/chromeos/user_cros_settings_provider.h
+++ b/chrome/browser/chromeos/user_cros_settings_provider.h
@@ -32,42 +32,17 @@ class UserCrosSettingsProvider : public CrosSettingsProvider {
   // Registers cached users settings in preferences.
   static void RegisterPrefs(PrefService* local_state);
 
-  // Methods to use when trusted (signature verified) values are required.
-  // Return true if subsequent call to corresponding cached_* getter shall
-  // return trusted value.
-  // Return false if trusted values are unavailable at a moment.
-  // In latter case passed task will be posted when ready.
-  bool RequestTrustedAllowGuest(Task* callback);
-  bool RequestTrustedAllowNewUser(Task* callback);
-  bool RequestTrustedDataRoamingEnabled(Task* callback);
-  bool RequestTrustedShowUsersOnSignin(Task* callback);
-  bool RequestTrustedOwner(Task* callback);
-  bool RequestTrustedReportingEnabled(Task* callback);
-
   // Reloads values from device settings.
   void Reload();
 
-  // Helper functions to access cached settings.
-  static bool cached_allow_guest();
-  static bool cached_allow_new_user();
-  static bool cached_data_roaming_enabled();
-  static bool cached_show_users_on_signin();
-  static bool cached_reporting_enabled();
-  static const base::ListValue* cached_whitelist();
-  static std::string cached_owner();
-
-  // Returns true if given email is in user whitelist.
-  // Note this function is for display purpose only and should use
-  // CheckWhitelist op for the real whitelist check.
-  static bool IsEmailInCachedWhitelist(const std::string& email);
-
   // CrosSettingsProvider implementation.
-  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;
 
-  void WhitelistUser(const std::string& email);
-  void UnwhitelistUser(const std::string& email);
+  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);