Remove unused UserSettingsChanged and UpdateGaia.

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index 22913caf5cebb3281e133926f84717f3758159fd..cce19f9c65086fcc9b26f13b1a34ff61d1cad711 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -1007,15 +1007,6 @@ bool SigninScreenHandler::ShouldLoadGaia() const {
          is_account_picker_showing_first_time_;
 }
 
-void SigninScreenHandler::UserSettingsChanged() {
-  DCHECK(gaia_screen_handler_);
-  GaiaContext context;
-  if (delegate_)
-    context.has_users = !delegate_->GetUsers().empty();
-  gaia_screen_handler_->UpdateGaia(context);
-  UpdateAddButtonStatus();
-}
-
 void SigninScreenHandler::UpdateAddButtonStatus() {
   CallJS("cr.ui.login.DisplayManager.updateAddUserButtonStatus",
          AllWhitelistedUsersPresent());