Change SVG paint server fallback for a non-existent URL

LayoutTests/svg/custom/recursive-pattern.svg

Index: LayoutTests/svg/custom/recursive-pattern.svg
diff --git a/LayoutTests/svg/custom/recursive-pattern.svg b/LayoutTests/svg/custom/recursive-pattern.svg
index 0830f8b6580be369d79b842653f721e7d7d0cd17..1d81e3ea4fd19a6ee9cccdecc060677f39589fe3 100644
--- a/LayoutTests/svg/custom/recursive-pattern.svg
+++ b/LayoutTests/svg/custom/recursive-pattern.svg
@@ -6,13 +6,13 @@
     </pattern>
 
     <pattern patternUnits="userSpaceOnUse" id="pattern1" x="0" y="0" width="100" height="100">
-        <rect x="0" y="0" width="50" height="50" fill="url(#pattern1)"/>
+        <rect x="0" y="0" width="50" height="50" fill="url(#pattern1) black"/>
         <rect x="50" y="50" width="100" height="100" fill="green"/>
     </pattern>
 
     <pattern patternUnits="userSpaceOnUse" id="pattern2" x="0" y="0" width="100" height="100">
         <rect x="50" y="50" width="100" height="100" fill="green"/>
-        <rect x="0" y="0" width="50" height="50" fill="url(#pattern1)"/>
+        <rect x="0" y="0" width="50" height="50" fill="url(#pattern1) black"/>
     </pattern>
 
     <pattern id="pattern3" x="0" y="0" width="100" height="100" xlink:href="#pattern1"/>
@@ -20,17 +20,17 @@
 
     <pattern id="pattern6" xlink:href="#pattern5"/>
     <pattern patternUnits="userSpaceOnUse"  id="pattern5" x="0" y="0" width="100" height="100">
-        <rect x="0" y="0" width="50" height="50" fill="url(#pattern6)"/>
+        <rect x="0" y="0" width="50" height="50" fill="url(#pattern6) black"/>
         <rect x="50" y="50" width="100" height="100" fill="green"/>
     </pattern>
 
-    <rect id="rect" x="0" y="0" width="50" height="50" fill="url(#pattern7)"/>
+    <rect id="rect" x="0" y="0" width="50" height="50" fill="url(#pattern7) black"/>
     <pattern patternUnits="userSpaceOnUse" id="pattern7" x="0" y="0" width="100" height="100">
         <use xlink:href="#rect"/>
         <rect id="reuse" x="50" y="50" width="100" height="100" fill="green"/>
     </pattern>
     
-    <rect id="rect2" x="0" y="0" width="50" height="50" fill="url(#pattern8)"/>
+    <rect id="rect2" x="0" y="0" width="50" height="50" fill="url(#pattern8) black"/>
     <use id="use" xlink:href="#rect2"/>
     <pattern patternUnits="userSpaceOnUse" id="pattern8" x="0" y="0" width="100" height="100">
         <g id="reuse2">