Don't let PaintInvalidationLocationChange shadow other reasons

third_party/WebKit/LayoutTests/fast/repaint/justify-self-overflow-change-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow HTML",
           "rect": [-50, 0, 850, 352],
           "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow BODY",
           "rect": [-50, 16, 850, 336],
           "reason": "bounds change"
         },
         {
           "object": "LayoutGrid DIV id='container'",
           "rect": [-50, 52, 250, 300],
           "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow DIV class='item1'",
           "rect": [0, 52, 150, 300],
-          "reason": "location change"
+          "reason": "style change"
         },
         {
           "object": "LayoutBlockFlow DIV class='item1'",
           "rect": [-50, 52, 150, 300],
-          "reason": "location change"
+          "reason": "style change"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [0, 52, 150, 150],
-          "reason": "location change"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [-50, 52, 150, 150],
-          "reason": "location change"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow DIV class='item2'",
           "rect": [150, 52, 50, 300],
           "reason": "style change"
         }
       ]
     }
   ]
 }