Update reason after full paint invalidation

third_party/WebKit/LayoutTests/paint/invalidation/positioned-great-grandparent-change-location-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow (positioned) DIV",
           "rect": [100, 200, 100, 100],
           "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow (positioned) DIV",
           "rect": [100, 100, 100, 100],
           "reason": "bounds change"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [100, 200, 40, 19],
-          "reason": "bounds change"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [100, 100, 40, 19],
-          "reason": "bounds change"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow (positioned) DIV",
       "reason": "location change"
     },
     {
@@ skipping 12 matching lines @@
       "object": "LayoutText #text",
       "reason": "bounds change"
     },
     {
       "object": "InlineTextBox 'Target'",
       "reason": "bounds change"
     }
   ]
 }