Refactors parse_html_subset() into i18n_behavior.

ui/webui/resources/js/parse_html_subset.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.
 
 /**
- * Parse a very small subset of HTML.  This ensures that insecure HTML /
+ * Parses a very small subset of HTML.  This ensures that insecure HTML /
  * javascript cannot be injected into the new tab page.
  * @param {string} s The string to parse.
  * @param {Array<string>=} opt_extraTags Optional extra allowed tags.
  * @param {Object<function(Node, string):boolean>=} opt_extraAttrs
  *     Optional extra allowed attributes (all tags are run through these).
  * @throws {Error} In case of non supported markup.
  * @return {DocumentFragment} A document fragment containing the DOM tree.
  */
 var parseHtmlSubset = (function() {
   'use strict';
@@ skipping 77 matching lines @@
         case Node.TEXT_NODE:
           break;
 
         default:
           throw Error('Node type ' + node.nodeType + ' is not supported');
       }
     });
     return df;
   };
 })();