Tame the proliferation of UserContext constructors

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 122 matching lines @@
 // Login -----------------------------------------------------------------------
 
 // Class is used to login using passed username and password.
 // The instance will be deleted upon success or failure.
 class StubLogin : public LoginStatusConsumer,
                   public LoginUtils::Delegate {
  public:
   StubLogin(std::string username, std::string password)
       : profile_prepared_(false) {
     authenticator_ = LoginUtils::Get()->CreateAuthenticator(this);
-    authenticator_.get()->AuthenticateToLogin(
-        ProfileHelper::GetSigninProfile(),
-        UserContext(username, password, std::string() /* auth_code */));
+    UserContext user_context(username);
+    user_context.SetPassword(password);
+    authenticator_.get()->AuthenticateToLogin(ProfileHelper::GetSigninProfile(),
+                                              user_context);
   }
 
   virtual ~StubLogin() {
     LoginUtils::Get()->DelegateDeleted(this);
   }
 
   virtual void OnLoginFailure(const LoginFailure& error) OVERRIDE {
     LOG(ERROR) << "Login Failure: " << error.GetErrorString();
     delete this;
   }
@@ skipping 701 matching lines @@
   // Destroy DBus services immediately after threads are stopped.
   dbus_services_.reset();
 
   ChromeBrowserMainPartsLinux::PostDestroyThreads();
 
   // Destroy DeviceSettingsService after g_browser_process.
   DeviceSettingsService::Shutdown();
 }
 
 }  //  namespace chromeos