Revert "Enforce clearing renderers' paint invalidation state"

LayoutTests/platform/mac/fast/repaint/selection-clear-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [8, 208, 100, 100],
-        [8, 208, 100, 100],
         [8, 108, 100, 100],
         [8, 49, 784, 159],
         [8, 49, 784, 59],
         [8, 49, 95, 118],
         [8, 49, 4, 18],
         [8, 8, 100, 200],
         [8, 8, 100, 200],
         [8, 8, 100, 100]
       ]
     }
   ]
 }