Rewrite HTML5 workers ui_tests to browser_tests. Compared to ui_tests, browser_tests are faster, le…

chrome/test/data/workers/worker_utils.js

 var shared_worker_count = 0;
 function getWorker(worker_url)
 {
   // Create either a dedicated or shared worker, depending on flags
   var url = document.location.toString();
   if (url.search("shared") >= 0) {
     // Make a shared worker that looks like a worker
     var worker = new SharedWorker(worker_url, "name" + ++shared_worker_count);
     worker.port.onmessage = function(evt) {
       worker.onmessage(evt);
@@ skipping 15 matching lines @@
 function onFailure() {
   setTimeout(onFinished, 0, "FAIL");
 }
 
 function onFinished(result) {
   var statusPanel = document.getElementById("statusPanel");
   if (statusPanel) {
     statusPanel.innerHTML = result;
   }
 
-  var cookie = "status=" + result + "; path=/";
-  document.cookie = cookie;
+  document.title = result;
 }