Formatting contexts should always expand to enclose floats

LayoutTests/platform/linux/fast/repaint/float-overflow-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [67, 426, 50, 10],
         [67, 420, 50, 10],
@@ skipping 14 matching lines @@
         [66, 290, 45, 20],
         [66, 288, 47, 22],
         [63, 23, 16, 16],
         [63, 21, 54, 19],
         [63, 21, 42, 19],
         [63, 21, 16, 19],
         [63, 17, 16, 16],
         [63, 15, 54, 19],
         [63, 15, 42, 19],
         [63, 15, 16, 19],
-        [61, 459, 62, 22],
-        [61, 453, 62, 22],
         [61, 420, 62, 22],
         [61, 414, 62, 22],
         [61, 288, 58, 28],
         [61, 282, 58, 28],
         [61, 15, 62, 25],
         [61, 9, 62, 25],
         [59, 545, 16, 16],
         [59, 543, 40, 20],
         [59, 543, 40, 19],
         [59, 543, 16, 19],
@@ skipping 11 matching lines @@
         [59, 498, 64, 25],
         [59, 498, 58, 19],
         [59, 498, 40, 19],
         [59, 498, 16, 19],
         [59, 492, 64, 25],
         [59, 467, 16, 16],
         [59, 465, 58, 19],
         [59, 465, 40, 19],
         [59, 465, 16, 19],
         [59, 461, 16, 16],
+        [59, 459, 64, 25],
         [59, 459, 58, 19],
         [59, 459, 40, 19],
         [59, 459, 16, 19],
+        [59, 453, 64, 25],
         [59, 428, 16, 16],
         [59, 426, 40, 19],
         [59, 426, 16, 19],
         [59, 422, 16, 16],
         [59, 420, 40, 19],
         [59, 420, 16, 19],
         [59, 257, 16, 16],
         [59, 255, 40, 19],
         [59, 255, 40, 19],
         [59, 255, 16, 19],
@@ skipping 77 matching lines @@
         [57, 54, 48, 19],
         [57, 54, 16, 19],
         [57, 48, 66, 25],
         [11, 366, 778, 28],
         [11, 360, 778, 28]
       ]
     }
   ]
 }