Fix some async repaint tests

LayoutTests/svg/custom/foreignObject-crash-on-hover.xml

 <?xml version="1.0"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
          "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <svg xmlns="http://www.w3.org/2000/svg"
      xmlns:xlink="http://www.w3.org/1999/xlink"
      xmlns:html="http://www.w3.org/1999/xhtml"
      height="600" width="800" onload="runRepaintAndPixelTest()">
   <script xlink:href="../../fast/repaint/resources/text-based-repaint.js"/>
   <g transform="translate(50,50)">
     <polygon points="0,0 300,0 300,300 0,300" style="fill:lightblue; stroke:red;"/>
     <!-- switch -->
     <foreignObject x="10" y="10" width="280" height="280">
       <html:b>Absolute Lineto</html:b><html:br/>
        &lt;path d="M50,80 L250,80 150,280 z" 
                 style="fill:red; stroke:blue;"/&gt;
     </foreignObject>
     <!-- /switch -->
     <path d="M50,80 L250,80 150,280 z" 
           style="fill:red; stroke:blue;"/>
   </g>
   <script>
+  window.testIsAsync = true;
   function repaintTest() {
     if (window.eventSender) {
-        testRunner.waitUntilDone();
         eventSender.mouseMoveTo(100, 100);
         eventSender.mouseUp();
         eventSender.mouseDown();
-        setTimeout("testRunner.notifyDone()", 0);
+        setTimeout(finishRepaintTest, 0);
     }
   }
   </script>
 </svg>