--- js/webgl-test-utils.js
+++ js/webgl-test-utils.js
@@ -2876,34 +2876,9 @@ var waitForComposite = function(callback) {
   countDown();
 };

-var setZeroTimeout = (function() {
-  // See https://dbaron.org/log/20100309-faster-timeouts
-
-  var timeouts = [];
-  var messageName = "zero-timeout-message";
-
-  // Like setTimeout, but only takes a function argument.  There's
-  // no time argument (always zero) and no arguments (you have to
-  // use a closure).
-  function setZeroTimeout(fn) {
-      timeouts.push(fn);
-      window.postMessage(messageName, "*");
-  }
-
-  function handleMessage(event) {
-      if (event.source == window && event.data == messageName) {
-          event.stopPropagation();
-          if (timeouts.length > 0) {
-              var fn = timeouts.shift();
-              fn();
-          }
-      }
-  }
-
-  window.addEventListener("message", handleMessage, true);
-
-  return setZeroTimeout;
-})();
+var setZeroTimeout = function(handler) {
+  window.setTimeout(handler, 0);
+}

 /**
  * Runs an array of functions, yielding to the browser between each step.