Optimize outline paint invalidation

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/delete-into-nested-block-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
-          "object": "LayoutBlockFlow DIV",
-          "rect": [7, 126, 786, 103],
-          "reason": "outline"
-        },
-        {
           "object": "LayoutBlockFlow DIV id='two'",
           "rect": [8, 147, 784, 41],
           "reason": "layoutObject removal"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [8, 167, 784, 21],
           "reason": "layoutObject removal"
         },
         {
@@ skipping 83 matching lines @@
     },
     {
       "object": "LayoutInline SPAN",
       "reason": "layoutObject removal"
     },
     {
       "object": "Caret",
       "reason": "invalidate paint rectangle"
     },
     {
-      "object": "LayoutBlockFlow DIV",
-      "reason": "outline"
-    },
-    {
       "object": "LayoutBlockFlow DIV id='one'",
       "reason": "full"
     },
     {
       "object": "RootInlineBox",
       "reason": "full"
     },
     {
       "object": "Caret",
       "reason": "invalidate paint rectangle"
     },
     {
       "object": "Caret",
       "reason": "invalidate paint rectangle"
     },
     {
       "object": "LayoutText #text",
       "reason": "layoutObject insertion"
     },
     {
       "object": "InlineTextBox 'three'",
       "reason": "layoutObject insertion"
     }
   ]
 }