Tame the proliferation of UserContext constructors

chrome/browser/chromeos/login/existing_user_controller.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 404 matching lines @@
     if (login_performer_delegate_.get())
       delegate = login_performer_delegate_.get();
     // Only one instance of LoginPerformer should exist at a time.
     login_performer_.reset(NULL);
     login_performer_.reset(new LoginPerformer(delegate));
   }
 
   is_login_in_progress_ = true;
   if (gaia::ExtractDomainName(user_context.GetUserID()) ==
           UserManager::kLocallyManagedUserDomain) {
-    login_performer_->LoginAsLocallyManagedUser(
-        UserContext(user_context.GetUserID(),
-                    user_context.GetPassword(),
-                    std::string()));  // auth_code
+    login_performer_->LoginAsLocallyManagedUser(user_context);
   } else {
     login_performer_->PerformLogin(user_context, auth_mode);
   }
   SendAccessibilityAlert(
       l10n_util::GetStringUTF8(IDS_CHROMEOS_ACC_LOGIN_SIGNING_IN));
 }
 
 void ExistingUserController::LoginAsRetailModeUser() {
   // Stop the auto-login timer when attempting login.
   StopPublicSessionAutoLoginTimer();
@@ skipping 681 matching lines @@
 }
 
 void ExistingUserController::SendAccessibilityAlert(
     const std::string& alert_text) {
   AccessibilityAlertInfo event(ProfileHelper::GetSigninProfile(), alert_text);
   SendControlAccessibilityNotification(
       ui::AX_EVENT_VALUE_CHANGED, &event);
 }
 
 }  // namespace chromeos