Remove text output from media-document-audio-repaint

LayoutTests/media/media-document-audio-repaint.html

-<style>
-    body {
-        overflow: hidden
-    }
-    pre {
-        position: absolute;
-        top: 10000px;
-    }
-</style>
 <script src="../resources/run-after-display.js"></script>
 <script>
     if (window.testRunner)
         testRunner.waitUntilDone();
 
     function onPause()
     {
         var videoElement = document.getElementById("fr").contentDocument.querySelector("video");
-        window.internals.startTrackingRepaints(document);
         runAfterDisplay(function() {
             videoElement.currentTime = videoElement.duration * 0.50;
         });
     }
 
     function onSeeked()
     {
-        var repaintRects = window.internals.repaintRectsAsText(document);
-        var pre = document.createElement('pre');
-        document.body.appendChild(pre);
-        pre.textContent += repaintRects;
-        window.internals.stopTrackingRepaints(document);
-
         if (window.testRunner)
             testRunner.notifyDone();
     }
 
     function frameLoaded()
     {
         var videoElement = document.getElementById("fr").contentDocument.querySelector("video");
         videoElement.addEventListener("pause", onPause, false);
         videoElement.addEventListener("seeked", onSeeked, false);
         // The MediaDocument has AUTOPLAY set, make sure we're paused.
         videoElement.pause();
     }
 </script>
 <p>
     This tests that in a standalone media document with audio content, the media element repaints correctly
     while playing.
 </p>
 <iframe src="content/silence.wav" id="fr" width=380 height=330 onload="frameLoaded()"></iframe>
 <script>// To produce the same layout as before iframe was moved down to avoid rebaselines of different platforms.
 // https://bugs.webkit.org/show_bug.cgi?id=54942
 </script>