Convert svg repaint tests to pixel test only repaint

LayoutTests/svg/custom/js-update-pattern-child.svg

Index: LayoutTests/svg/custom/js-update-pattern-child.svg
diff --git a/LayoutTests/svg/custom/js-update-pattern-child.svg b/LayoutTests/svg/custom/js-update-pattern-child.svg
index 32a92d9d231707bf72aba8c7fd532b23508fde0c..2f1e200cb1adc496cbb8a3ac5ae3176833d44bc7 100644
--- a/LayoutTests/svg/custom/js-update-pattern-child.svg
+++ b/LayoutTests/svg/custom/js-update-pattern-child.svg
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
-<svg width="450" height="450" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runRepaintTest()">
-<script xlink:href="../../fast/repaint/resources/repaint.js"/>
+<svg width="450" height="450" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runRepaintAndPixelTest()">
+<script xlink:href="../../fast/repaint/resources/text-based-repaint.js"/>
 <defs>
     <pattern patternUnits="userSpaceOnUse" id="Pattern" x="0" y="0" width="20" height="20">
         <rect x="5" y="5" width="10" height="10" fill="red" />