Use window.URL instead of window.webkitURL.

chrome/browser/resources/sync_internals/data.js

 // Copyright (c) 2011 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.
 
 (function() {
 var dumpToTextButton = $('dump-to-text');
 var dataDump = $('data-dump');
 dumpToTextButton.addEventListener('click', function(event) {
   // TODO(akalin): Add info like Chrome version, OS, date dumped, etc.
 
@@ skipping 71 matching lines @@
   // Some types, such as 'Top level folder', appear in the list of nodes
   // but not in the list of selectable items.
   if (typeCheckbox == null) {
     return false;
   }
   return typeCheckbox.checked;
 }
 
 function makeBlobUrl(data) {
   var textBlob = new Blob([data], {type: 'octet/stream'});
-  var blobUrl = window.webkitURL.createObjectURL(textBlob);
+  var blobUrl = window.URL.createObjectURL(textBlob);
   return blobUrl;
 }
 
 function makeDownloadName() {
   // Format is sync-data-dump-$epoch-$year-$month-$day-$OS.csv.
   var now = new Date();
   var friendlyDate = [now.getFullYear(),
                       now.getMonth() + 1,
                       now.getDate()].join('-');
   var name = ['sync-data-dump',
@@ skipping 72 matching lines @@
       chrome.sync.getNodeSummariesById(childNodeIds, populateDatatypes);
     });
   });
 });
 
 var dumpToFileLink = $('dump-to-file');
 dumpToFileLink.addEventListener('click', function(event) {
   chrome.sync.getAllNodes(triggerDataDownload);
 });
 })();