Add TODOs to convert from video-test.js to testharness.js

third_party/WebKit/LayoutTests/media/media-reparent.html

 Test that reparenting a removed media tag doesn't crash the process.
+<!-- TODO(philipj): Convert test to testharness.js. crbug.com/588956
+     (Please avoid writing new tests using video-test.js) -->
 <script src=video-test.js></script>
 <script>
 setTimeout(function(){
     var f = document.createElement('iframe');
     document.documentElement.appendChild(f);
     var w = f.contentWindow;
     var div = w.document.createElement('div');
     div.innerHTML = '<audio src="1">';
     var node = div;
     f.parentNode.removeChild(f);
     document.body.appendChild(node);
     endTestLater();
 })
 </script>