DevTools: Get rid of synchronous XHRs in the frontend code

Source/devtools/front_end/audits/AuditRules.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 516 matching lines @@
         this._styleSheetsParsedCallback(this._styleSheets);
     },
 
     _processNextStyleSheet: function()
     {
         if (!this._styleSheetHeaders.length) {
             this._finish();
             return;
         }
         this._currentStyleSheetHeader = this._styleSheetHeaders.shift();
-        this._parser.fetchAndParse(this._currentStyleSheetHeader, this._onStyleSheetParsed.bind(this));
+        this._parser.fetchAndParse(this._currentStyleSheetHeader).then(this._onStyleSheetParsed.bind(this)).done();
     },
 
     /**
      * @param {!Array.<!WebInspector.CSSParser.Rule>} rules
      */
     _onStyleSheetParsed: function(rules)
     {
         if (this._progress.isCanceled()) {
             this._terminateWorker();
             return;
@@ skipping 1049 matching lines @@
         result.violationCount = badUrls.length;
     },
 
     _collectorCallback: function(matchingResourceData, request, cookie)
     {
         matchingResourceData[request.url] = (matchingResourceData[request.url] || 0) + cookie.size();
     },
 
     __proto__: WebInspector.AuditRules.CookieRuleBase.prototype
 }