Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/paint/invalidation/compositing/repaint-squashed-layer-in-rect-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [808, 816],
       "contentsOpaque": true,
       "drawsContent": true
     },
     {
       "name": "Squashing Containment Layer",
       "shouldFlattenTransform": false
     },
     {
       "name": "LayoutBlockFlow DIV",
       "position": [8, 8],
       "bounds": [800, 800],
       "contentsOpaque": true,
       "drawsContent": true,
       "backgroundColor": "#D3D3D3"
     },
     {
       "name": "Squashing Layer (first squashed layer: LayoutBlockFlow (positioned) DIV)",
       "position": [8, 0],
       "bounds": [592, 600],
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow DIV id='imgElement'",
           "rect": [392, 400, 200, 200],
-          "reason": "style change"
+          "reason": "image"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow DIV id='imgElement'",
-      "reason": "style change"
+      "reason": "image"
     }
   ]
 }