Tweak priorities of paint invalidation reasons

third_party/WebKit/LayoutTests/platform/linux/fast/repaint/selection-clear-expected.txt

 {
   "name": "Content Root Layer",
   "bounds": [800, 600],
   "children": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
@@ skipping 70 matching lines @@
     {
       "object": "LayoutBlockFlow (anonymous)",
       "reason": "bounds change"
     },
     {
       "object": "RootInlineBox",
       "reason": "bounds change"
     },
     {
       "object": "LayoutBR BR",
-      "reason": "bounds change"
+      "reason": "selection"
     },
     {
       "object": "InlineTextBox '\n'",
-      "reason": "bounds change"
+      "reason": "selection"
+    },
+    {
+      "object": "LayoutBR BR",
+      "reason": "location change"
+    },
+    {
+      "object": "InlineTextBox '\n'",
+      "reason": "location change"
     }
   ]
 }