cros: Update SAML flow.

chrome/browser/resources/chromeos/login/screen_message_box.js

-// 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.
-
-/**
- * @fileoverview A simple message box screen implementation.
- */
-
-login.createScreen('MessageBoxScreen', 'message-box', function() { return {
-    EXTERNAL_API: [
-      'show'
-    ],
-
-    /**
-     * Callback to run when the screen is dismissed.
-     * @type {function()}
-     */
-    callback_: null,
-
-    /**
-     * Ok button of the message box.
-     * @type {HTMLButtonElement}
-     */
-    okButton_: null,
-
-    /**
-     * Saved hidden status of 'progress-dots'.
-     * @type {boolean}
-     */
-    savedProgressDotsHidden_: null,
-
-    /**
-     * Screen controls in bottom strip.
-     * @type {Array.<HTMLButtonElement>} Buttons to be put in the bottom strip.
-     */
-    get buttons() {
-      var buttons = [];
-
-      this.okButton_ = this.ownerDocument.createElement('button');
-      this.okButton_.addEventListener('click', this.onDismiss_.bind(this));
-      buttons.push(this.okButton_);
-
-      return buttons;
-    },
-
-    get defaultControl() {
-      return this.okButton_;
-    },
-
-    /**
-     * Invoked when user clicks on the ok button.
-     */
-    onDismiss_: function() {
-      this.callback_();
-      $('progress-dots').hidden = this.savedProgressDotsHidden_;
-    },
-
-    /**
-     * Shows the no password warning screen.
-     * @param {string} title Title string of the message box.
-     * @param {string} message Body text of the message box.
-     * @param {string} okLabel Label text for the okay button.
-     * @param {function()} callback The callback to be invoked when the
-     *     screen is dismissed.
-     */
-    show: function(title, message, okLabel, callback) {
-      $('message-box-title').textContent = title;
-      $('message-box-body').textContent = message;
-      this.okButton_.textContent = okLabel;
-      this.callback_ = callback;
-
-      Oobe.showScreen({id: SCREEN_MESSAGE_BOX});
-
-      this.savedProgressDotsHidden_ = $('progress-dots').hidden;
-      $('progress-dots').hidden = true;
-    }
-  };
-});