Rebaseline SlimmingPaintInvalidation test expectations

third_party/WebKit/LayoutTests/flag-specific/enable-blink-features=SlimmingPaintInvalidation/paint/invalidation/svg/tabgroup-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
-          "object": "LayoutSVGRoot svg",
-          "rect": [7, 7, 736, 573],
-          "reason": "became visible"
-        },
-        {
           "object": "LayoutSVGPath path",
           "rect": [389, 38, 316, 81],
           "reason": "layoutObject insertion"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [389, 38, 316, 81],
           "reason": "layoutObject insertion"
         },
         {
@@ skipping 959 matching lines @@
     },
     {
       "object": "LayoutSVGText text",
       "reason": "layoutObject removal"
     },
     {
       "object": "LayoutSVGHiddenContainer g id='oversizeContent'",
       "reason": "layoutObject removal"
     },
     {
-      "object": "LayoutSVGRoot svg",
-      "reason": "became visible"
-    },
-    {
       "object": "LayoutSVGContainer g id='tabgroupRect'",
       "reason": "became visible"
     },
     {
       "object": "LayoutSVGContainer g",
       "reason": "layoutObject insertion"
     },
     {
       "object": "LayoutSVGContainer g",
       "reason": "layoutObject insertion"
@@ skipping 982 matching lines @@
       "object": "InlineTextBox 'Biography'",
       "reason": "layoutObject insertion"
     },
     {
       "object": "LayoutSVGContainer g id='tabgroupRectRound__0_content'",
       "reason": "layoutObject insertion"
     }
   ]
 }