Simplify ObjectPaintInvalidatorW/C::computePaintInvalidationReason()

third_party/WebKit/LayoutTests/paint/invalidation/svg/relative-sized-use-without-attributes-on-symbol-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow div id='contentBox'",
@@ skipping 16 matching lines @@
           "reason": "forced by layout"
         },
         {
           "object": "LayoutSVGViewportContainer svg id='gamesBorder'",
           "rect": [27, 67, 364, 364],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [16, 57, 136, 137],
-          "reason": "full"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutSVGContainer use",
           "rect": [13, 205, 92, 91],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGPath path",
           "rect": [13, 205, 92, 91],
           "reason": "bounds change"
@@ skipping 27 matching lines @@
     {
       "object": "LayoutSVGHiddenContainer defs",
       "reason": "location change"
     },
     {
       "object": "LayoutSVGHiddenContainer symbol id='gamesBorder'",
       "reason": "location change"
     },
     {
       "object": "LayoutSVGPath path",
-      "reason": "full"
+      "reason": "bounds change"
     },
     {
       "object": "LayoutSVGContainer use",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGViewportContainer svg id='gamesBorder'",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGPath path",
       "reason": "bounds change"
     }
   ]
 }