Revert of De-flaking some tests in virtual/gpu/fast/canvas

LayoutTests/fast/canvas/canvas-toDataURL-jpeg-maximum-quality.html

 The letters in the right image should be crisp and non-blurry like the letters in the left image.<p>
 <canvas></canvas>
 <img id="result" onload="testDone()">
 
 <script>
 if (window.testRunner) {
     window.testRunner.dumpAsTextWithPixelResults();
     window.testRunner.waitUntilDone();
 }
 
 function testDone()
 {
     if (window.testRunner)
-        window.testRunner.layoutAndPaintAsyncThen(function(){ testRunner.notifyDone(); });
+        window.testRunner.notifyDone();
 }
 
 var image = new Image();
 image.onload = function() {
     var canvas = document.querySelector('canvas');
     canvas.width = this.width;
     canvas.height = this.height;
     canvas.getContext('2d').drawImage(this, 0, 0);
     result.src = canvas.toDataURL('image/jpeg', 1.0);
     document.body.style.zoom = 1.3;
 };
 
 image.src = "resources/letters.png";
 </script>