Tweak PaintInvalidationReasons

third_party/WebKit/LayoutTests/paint/invalidation/selection/invalidation-rect-with-br-includes-newline-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBR BR",
           "rect": [24, 8, 16, 16],
-          "reason": "became visible"
+          "reason": "appeared"
         },
         {
           "object": "LayoutText #text",
           "rect": [8, 24, 16, 16],
           "reason": "selection"
         },
         {
           "object": "LayoutText #text",
           "rect": [8, 8, 16, 16],
           "reason": "selection"
@@ skipping 17 matching lines @@
     {
       "object": "LayoutText #text",
       "reason": "selection"
     },
     {
       "object": "InlineTextBox 'a'",
       "reason": "selection"
     },
     {
       "object": "LayoutBR BR",
-      "reason": "became visible"
+      "reason": "appeared"
     },
     {
       "object": "InlineTextBox '\n'",
-      "reason": "became visible"
+      "reason": "appeared"
     },
     {
       "object": "LayoutText #text",
       "reason": "selection"
     },
     {
       "object": "InlineTextBox 'b'",
       "reason": "selection"
     }
   ]
 }