Convert svg repaint tests to pixel test only repaint

LayoutTests/svg/custom/use-disappears-after-style-update.svg

 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
-  style="width:300px;height:400px" onload="runRepaintTest()">
+  style="width:300px;height:400px" onload="runRepaintAndPixelTest()">
 
-<script xlink:href="../../fast/repaint/resources/repaint.js"/>
+<script xlink:href="../../fast/repaint/resources/text-based-repaint.js"/>
 <!-- This tests filters failing to refresh after the initial rendering
 (https://bugs.webkit.org/show_bug.cgi?id=53088).
 There should be two green squares in the output. -->
 
 <defs>
 <filter id="simple" x="0" y="0">
   <feOffset in="SourceGraphic" dx="0" dy="0" />
 </filter>
 
 <rect id="rect" width="30" y="10" height="30" fill="red" />
 
 </defs>
 
 <g>
 
 <use xlink:href="#rect" x="10" />
 
 <use filter="url(#simple)" xlink:href="#rect" x="50" />
 
 </g>
 
 <script><![CDATA[
     function repaintTest() {
         document.getElementById("rect").setAttribute("fill", "green");
     }
 ]]></script>
 
 </svg>