Partial revert of r161493.

LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html

Index: LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html
diff --git a/LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html b/LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html
index 61413fc187c27eedb7ba58f0616253a3ae4fc971..b85e8d0f118d4775a323b6a44f30c5d5150248a4 100644
--- a/LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html
+++ b/LayoutTests/http/tests/misc/video-poster-image-load-outlives-gc-without-crashing.html
@@ -2,14 +2,16 @@
 <script>
 
 if (window.testRunner) {
-	window.jsTestIsAsync = true;
+	testRunner.waitUntilDone();
 	testRunner.dumpAsText();
 }
 
 function loaded() {
 	// If the garbage collection causes the image load to stop and therefore causes the load event to fire on the main frame, we failed.
 	alert("FAIL: The load event fired");
-	finishJSTest();
+	
+	if (window.testRunner)
+		testRunner.notifyDone();
 }
 
 </script>
@@ -25,7 +27,8 @@ This has a video element with an image for its poster frame.  That video element
 
 function finished() {
 	window.stop()
-	finishJSTest();
+	if (window.testRunner)
+		testRunner.notifyDone();
 }
 
 function forceGC() {