DevTools: remove unnecessary setInterval from worker-events.html test

BUG=None

Review URL: https://codereview.chromium.org/643533003

git-svn-id: svn://svn.chromium.org/blink/trunk@184152 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/inspector/tracing/resources/worker.js

-onmessage = function(event) {
-    doWork();
-    // FIXME: we need a better way of waiting for layout/repainting to happen
-    setInterval(doWork, 1);
-};
 var message_id = 0;
-function doWork()
+onmessage = function(event)
 {
-    postMessage("Message #" + message_id++);
-}
+    postMessage("Ack #" + message_id++);
+};

third_party/WebKit/LayoutTests/inspector/tracing/worker-events.html

@@ -5,9 +5,13 @@
 <script src="../tracing-test.js"></script>
 <script>
 
+// Save references to the worker objects to make sure they are not GC'ed.
+var worker1;
+var worker2;
+
 function startWorkerAndRunTest()
 {
-    var worker1 = new Worker("resources/worker.js");
+    worker1 = new Worker("resources/worker.js");
     worker1.postMessage("");
 
     if (window.testRunner) {
@@ -24,7 +28,7 @@ function startWorkerAndRunTest()
 
 function startSecondWorker(onActionComplete)
 {
-    var worker2 = new Worker("resources/worker.js");
+    worker2 = new Worker("resources/worker.js");
     worker2.postMessage("");
     worker2.onmessage = function(event)
     {