Migrate svg layout tests to use slimming paint by default

LayoutTests/platform/linux/svg/custom/relative-sized-shadow-tree-content-with-symbol-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [109, 173, 100, 100],
         [34, 173, 25, 25],
         [9, 148, 50, 50],
         [9, 148, 50, 50],
         [9, 148, 50, 50],
         [9, 148, 25, 25],
         [9, 73, 200, 200],
         [9, 73, 200, 200],
         [9, 73, 200, 200],
         [9, 73, 100, 100],
         [8, 72, 402, 405],
         [8, 72, 102, 405]
+      ],
+      "paintInvalidationClients": [
+        "RootInlineBox",
+        "InlineBox",
+        "LayoutBlockFlow div id='contentBox'",
+        "LayoutSVGRoot svg",
+        "LayoutSVGContainer use",
+        "LayoutSVGViewportContainer svg id='targetSymbol'",
+        "LayoutSVGRect rect",
+        "LayoutSVGRect rect"
       ]
     }
   ]
 }