Remove beforeload events.

LayoutTests/http/tests/media/video-play-stall-before-meta-data.html

 <video></video>
 <p>Test that stalling very early, while loading meta-data, stops delaying the load event.</p>
 <script src=../../media-resources/media-file.js></script>
 <script src=../../media-resources/video-test.js></script>
 <script>
 
     // Expected events.
-    waitForEvent("beforeload");
     waitForEvent("loadstart");
     waitForEvent("stalled");
     waitForEvent("suspend");
 
     // We want to make sure the onload event fires.
     window.onload = function() {
        consoleWrite("EVENT(window.onload)");
        endTest();
     };
 
     // Find a supported media file.
     var mediaFile = findMediaFile("video", "content/test");
     var mimeType = mimeTypeForFile(mediaFile);
 
     // Load should stall very early in the loading process.
     video.src = "http://127.0.0.1:8000/resources/load-and-stall.cgi?name=../../../media/" + mediaFile + "&mimeType=" + mimeType + "&stallAt=1&stallFor=4";
 
 </script>