[sync] Display an error when sync settings aren't confirmed

chrome/browser/resources/options/browser_options.js

 // 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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            accountInfo: (string|undefined),
  *            childUser: (boolean|undefined),
@@ skipping 1225 matching lines @@
               chrome.send('SyncSetupStopSyncing', [false /* deleteProfile */]);
               SyncSetupOverlay.startSignIn(false /* creatingSupervisedUser */);
             } else {
               chrome.send('showDisconnectManagedProfileDialog');
             }
 // </if>
             break;
           case 'upgradeClient':
             PageManager.showPageByName('help');
             break;
+          case 'confirmSyncSettings':
           default:
             SyncSetupOverlay.showSetupUI();
         }
       };
 
       if (syncData.hasError)
         $('sync-status').classList.add('sync-error');
       else
         $('sync-status').classList.remove('sync-error');
 
@@ skipping 1226 matching lines @@
 
       settings.hidden = !isVisible;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });