Remove unused UserSettingsChanged and UpdateGaia.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

 // Copyright (c) 2013 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_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 298 matching lines @@
 
   // content::NotificationObserver implementation:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   // TouchViewControllerDelegate::Observer implementation:
   void OnMaximizeModeStarted() override;
   void OnMaximizeModeEnded() override;
 
-  // Updates authentication extension. Called when device settings that affect
-  // sign-in (allow BWSI and allow whitelist) are changed.
-  void UserSettingsChanged();
   void UpdateAddButtonStatus();
 
   // Restore input focus to current user pod.
   void RefocusCurrentPod();
 
   // WebUI message handlers.
   void HandleGetUsers();
   void HandleAuthenticateUser(const std::string& username,
                               const std::string& password);
   void HandleAttemptUnlock(const std::string& username);
@@ skipping 165 matching lines @@
   scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
 
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_