Simplify ObjectPaintInvalidatorW/C::computePaintInvalidationReason()

third_party/WebKit/LayoutTests/paint/invalidation/svg/relative-sized-deep-shadow-tree-content-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow div id='contentBox'",
@@ skipping 26 matching lines @@
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect id='targetRect'",
           "rect": [109, 169, 200, 200],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect id='targetRect'",
           "rect": [9, 169, 200, 200],
-          "reason": "full"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutSVGContainer g id='targetUse'",
           "rect": [59, 269, 50, 200],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGContainer use",
           "rect": [59, 269, 50, 200],
           "reason": "bounds change"
@@ skipping 33 matching lines @@
     {
       "object": "LayoutSVGRoot svg",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutSVGHiddenContainer defs",
       "reason": "location change"
     },
     {
       "object": "LayoutSVGRect rect id='targetRect'",
-      "reason": "full"
+      "reason": "bounds change"
     },
     {
       "object": "LayoutSVGContainer use id='targetUse'",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGRect rect id='targetRect'",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGContainer use",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGContainer g id='targetUse'",
       "reason": "bounds change"
     },
     {
       "object": "LayoutSVGRect rect id='targetRect'",
       "reason": "bounds change"
     }
   ]
 }