Remove the HasOwnBackingButPaintsIntoAncestor compositing state.

LayoutTests/compositing/change-from-paints-into-ancestor-to-paints-into-own-backing-for-intrinsic-reason-expected.txt

Index: LayoutTests/compositing/change-from-paints-into-ancestor-to-paints-into-own-backing-for-intrinsic-reason-expected.txt
diff --git a/LayoutTests/compositing/change-from-paints-into-ancestor-to-paints-into-own-backing-for-intrinsic-reason-expected.txt b/LayoutTests/compositing/change-from-paints-into-ancestor-to-paints-into-own-backing-for-intrinsic-reason-expected.txt
deleted file mode 100644
index b084b9525bac3f2755b57e78dfb6b8d845be6272..0000000000000000000000000000000000000000
--- a/LayoutTests/compositing/change-from-paints-into-ancestor-to-paints-into-own-backing-for-intrinsic-reason-expected.txt
+++ /dev/null
@@ -1,48 +0,0 @@
-{
-  "bounds": [800, 600],
-  "children": [
-    {
-      "bounds": [800, 600],
-      "contentsOpaque": true,
-      "drawsContent": true,
-      "repaintRects": [
-        [8, 8, 784, 100]
-      ],
-      "children": [
-        {
-          "position": [8, 8],
-          "bounds": [784, 100],
-          "opacity": 0,
-          "contentsOpaque": true,
-          "drawsContent": true,
-          "backgroundColor": "#FF0000",
-          "repaintRects": [
-            [0, 0, 784, 100]
-          ],
-          "children": [
-            {
-              "bounds": [784, 100],
-              "shouldFlattenTransform": false,
-              "transform": [
-                [1, 0, 0, 0],
-                [0, 1, 0, 0],
-                [0, 0, 1, -1],
-                [0, 0, 0, 1]
-              ],
-              "children": [
-                {
-                  "bounds": [100, 100],
-                  "contentsOpaque": true,
-                  "drawsContent": true,
-                  "backfaceVisibility": "hidden",
-                  "backgroundColor": "#0000FF"
-                }
-              ]
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}
-