Strength-reduce the "scale-factor changed" condition in LayoutSVGRoot

third_party/WebKit/LayoutTests/paint/invalidation/svg/absolute-sized-content-with-resources-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow div id='contentBox'",
           "rect": [8, 50, 402, 402],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutSVGContainer g",
           "rect": [42, 117, 334, 268],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect",
           "rect": [42, 117, 334, 268],
-          "reason": "bounds change"
+          "reason": "SVG resource change"
         },
         {
           "object": "LayoutSVGRoot svg",
           "rect": [42, 117, 334, 268],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutSVGEllipse circle",
           "rect": [242, 251, 167, 200],
           "reason": "bounds change"
@@ skipping 14 matching lines @@
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGContainer g",
           "rect": [17, 217, 84, 68],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect",
           "rect": [17, 217, 84, 68],
-          "reason": "bounds change"
+          "reason": "SVG resource change"
         },
         {
           "object": "LayoutSVGRoot svg",
           "rect": [17, 217, 84, 68],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutSVGEllipse circle",
           "rect": [67, 251, 42, 67],
           "reason": "bounds change"
@@ skipping 34 matching lines @@
     {
       "object": "LayoutSVGEllipse circle",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGContainer g",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGRect rect",
-      "reason": "bounds change"
+      "reason": "SVG resource change"
     }
   ]
 }