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

LayoutTests/inspector/tracing/resources/worker.js

Index: LayoutTests/inspector/tracing/resources/worker.js
diff --git a/LayoutTests/inspector/tracing/resources/worker.js b/LayoutTests/inspector/tracing/resources/worker.js
index 890daa22188ec576bc7706369152971fecbe250b..baf6fbde6724f5cdb4844f9d64da8f61229ea1dc 100644
--- a/LayoutTests/inspector/tracing/resources/worker.js
+++ b/LayoutTests/inspector/tracing/resources/worker.js
@@ -1,10 +1,5 @@
-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++);
+};