Rename fetch layout tests.

LayoutTests/http/tests/fetch/resources/thorough-iframe.html

 <script src = "fetch-test-options.js"></script>
-<script src = "fetch-access-control-util.js"></script>
+<script src = "thorough-util.js"></script>
 <script>
 function onMessage(event) {
   var script = document.createElement('script');
   script.src = event.data.url;
   script.addEventListener(
     'error',
     function() { report({jsonpResult:'error'}); });
   document.body.appendChild(script);
 }
 function report(data) {
   window.parent.postMessage(
     data,
     BASE_ORIGIN);
 }
 function onload() {
   window.addEventListener('message', onMessage, false);
 }
 window.addEventListener('load', onload);
-</script>
+</script>