LayoutTests/http/tests/security/mixedContent/resources/frame-with-insecure-plugin.html

<script>
window.onload = function() {
  if (window.opener)
    window.opener.postMessage('done', '*');
}
</script>
<object name='plugin' type='application/x-webkit-test-netscape'>
  <param name='movie' value='http://127.0.0.1:8000/security/mixedContent/resources/dummy.swf' />
</object>