Move Frame to the Oilpan heap.

LayoutTests/fast/events/message-port-gc-closed.html

Index: LayoutTests/fast/events/message-port-gc-closed.html
diff --git a/LayoutTests/fast/events/message-port-gc-closed.html b/LayoutTests/fast/events/message-port-gc-closed.html
index 4dba52da1a27ae633a9d72d6f1fc2a8b59fb1f41..3dedd8232bf3217d2e4febf486ce6285ec985444 100644
--- a/LayoutTests/fast/events/message-port-gc-closed.html
+++ b/LayoutTests/fast/events/message-port-gc-closed.html
@@ -4,13 +4,19 @@
 <script>
 jsTestIsAsync = true;
 description("MessagePorts (and their execution contexts) should be collected by GC once close() has been called on them");
-window.onmessage = function(evt) {
+function finishTest() {
     iframeDocGC = internals.observeGC(document.querySelector('iframe').contentDocument);
     document.querySelector('iframe').remove();
     gc();
     shouldBeTrue("iframeDocGC.wasCollected");
     finishJSTest();
 }
+window.onmessage = function(evt) {
+    // The iframe is reachable via evt.source, and evt is on the
+    // stack, so restart the test once that reference has gone out of
+    // scope.
+    setTimeout(finishTest, 0);
+}
 </script>
 <iframe src="resources/message-port-gc-closed-iframe.html"></iframe>
 </body>