Remove retail mode.

chrome/browser/resources/chromeos/login/demo_user_login.css

-/* 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.
- */
-
-html,
-body {
-  height: 100%;
-  width: 100%;
-}
-
-body {
-  background: #000;
-  margin: 0;
-  overflow: hidden;
-  padding: 0;
-}
-
-#page {
-  -webkit-box-align: center;
-  -webkit-box-pack: center;
-  /* Delay the login screen for 2 seconds then fade it in. */
-  -webkit-transition: opacity 1s linear 2s;
-  background: white;
-  display: -webkit-box;
-  height: 100%;
-  opacity: 0;
-  position: absolute;
-  width: 100%;
-}
-
-#logo-container {
-  text-align: center;
-}
-
-#logo {
-  width: 150px;
-}
-
-#demo-login-text {
-  font-size: 14px;
-  padding-left: 30px;
-  padding-top: 10px;
-}
-
-#lower-container {
-  height: 40px;
-}