Convert svg repaint tests to pixel test only repaint

LayoutTests/svg/custom/js-update-stop-linked-gradient.svg

Index: LayoutTests/svg/custom/js-update-stop-linked-gradient.svg
diff --git a/LayoutTests/svg/custom/js-update-stop-linked-gradient.svg b/LayoutTests/svg/custom/js-update-stop-linked-gradient.svg
index 6afa40f4f87462caded53d4ee8b9fed65d604448..868891203a64b51ff0009ada48406c34f58f62d3 100644
--- a/LayoutTests/svg/custom/js-update-stop-linked-gradient.svg
+++ b/LayoutTests/svg/custom/js-update-stop-linked-gradient.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>
     <linearGradient id="gradient" gradientUnits="userSpaceOnUse" x1="10" y1="10" x2="440" y2="10">
         <stop stop-color="green" offset="0"/>