Add CheckAndroidManagement to ARC sign-in flow.

chrome/browser/resources/chromeos/arc_support/background.js

 // Copyright 2016 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.
 
 /**
  * UI Pages. Note the order must be in sync with the
  * ArcAuthService::UIPage enum.
  * @type {Array<string>}
  */
 var UI_PAGES = ['none',
@@ skipping 170 matching lines @@
     };
 
     var onWebviewRequestResponseStarted = function(details) {
       if (isApprovalResponse(details.url)) {
         showPage('arc-loading');
       }
     };
 
     var onWebviewContentLoad = function() {
       if (!isApprovalResponse(webview.src)) {
-        // Show LSO page when its content is ready.
-        showPage('lso');
         return;
       }
 
       webview.executeScript({code: 'document.title;'}, function(results) {
         var authCodePrefix = 'Success code=';
         if (results[0].substring(0, authCodePrefix.length) ==
             authCodePrefix) {
           var authCode = results[0].substring(authCodePrefix.length);
           sendNativeMessage('setAuthCode', {code: authCode});
         } else {
@@ skipping 49 matching lines @@
       type: 'chrome',
       color: '#67a030'
     },
     'innerBounds': {
       'width': 800,
       'height': 600
     }
   };
   chrome.app.window.create('main.html', options, onWindowCreated);
 });