This is a test for <a href="http://bugs.webkit.org/show_bug.cgi?id=13868">http://bugs.webkit.org/show_bug.cgi?id=13868</a> 
REGRESSION: crash on accessing a new iframe's contentWindow property.

This tests HTMLIFrameElement.contentWindow.

If there is no crash this test passes.
<script type="text/javascript">
    if (window.testRunner)
        testRunner.dumpAsText();
    document.createElement('iframe').contentWindow;
</script>