Tame the proliferation of UserContext constructors

chrome/browser/chromeos/login/login_manager_test.cc

 // Copyright 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.
 
 #include "chrome/browser/chromeos/login/login_manager_test.h"
 
 #include "base/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
@@ skipping 63 matching lines @@
 }
 
 bool LoginManagerTest::AddUserToSession(const std::string& username,
                                         const std::string& password) {
   ExistingUserController* controller =
       ExistingUserController::current_controller();
   if (!controller) {
     ADD_FAILURE();
     return false;
   }
-  controller->Login(UserContext(username, password, std::string()));
+  UserContext user_context(username);
+  user_context.SetPassword(password);
+  controller->Login(user_context);
   content::WindowedNotificationObserver(
       chrome::NOTIFICATION_SESSION_STARTED,
       content::NotificationService::AllSources()).Wait();
   const UserList& logged_users = UserManager::Get()->GetLoggedInUsers();
   for (UserList::const_iterator it = logged_users.begin();
        it != logged_users.end(); ++it) {
     if ((*it)->email() == username)
       return true;
   }
   return false;
@@ skipping 18 matching lines @@
     EXPECT_TRUE(host != NULL);
 
     content::WebContents* web_contents =
         host->GetWebUILoginView()->GetWebContents();
     EXPECT_TRUE(web_contents != NULL);
     set_web_contents(web_contents);
     js_checker_.set_web_contents(web_contents);
   }
 
 }  // namespace chromeos