Remove the HasOwnBackingButPaintsIntoAncestor compositing state.

LayoutTests/compositing/backing/no-backing-for-perspective-expected.txt

Index: LayoutTests/compositing/backing/no-backing-for-perspective-expected.txt
diff --git a/LayoutTests/compositing/backing/no-backing-for-perspective-expected.txt b/LayoutTests/compositing/backing/no-backing-for-perspective-expected.txt
deleted file mode 100644
index fdf1c99bce87a71ad9e676997a2e3a7f7c45897a..0000000000000000000000000000000000000000
--- a/LayoutTests/compositing/backing/no-backing-for-perspective-expected.txt
+++ /dev/null
@@ -1,64 +0,0 @@
-This layer should not have backing store.
-This layer should not have backing store.
-{
-  "bounds": [800, 600],
-  "children": [
-    {
-      "bounds": [800, 600],
-      "contentsOpaque": true,
-      "drawsContent": true,
-      "children": [
-        {
-          "position": [8, 8],
-          "bounds": [342, 240],
-          "children": [
-            {
-              "bounds": [342, 240],
-              "shouldFlattenTransform": false,
-              "transform": [
-                [1, 0, 0, 0],
-                [0, 1, 0, 0],
-                [0, 0, 1, -0.002],
-                [0, 0, 0, 1]
-              ],
-              "children": [
-                {
-                  "position": [21, 39],
-                  "bounds": [342, 180],
-                  "children": [
-                    {
-                      "bounds": [342, 180],
-                      "shouldFlattenTransform": false,
-                      "transform": [
-                        [1, 0, 0, 0],
-                        [0, 1, 0, 0],
-                        [0, 0, 1, -0.002],
-                        [0, 0, 0, 1]
-                      ],
-                      "children": [
-                        {
-                          "position": [31, 49],
-                          "bounds": [100, 100],
-                          "contentsOpaque": true,
-                          "drawsContent": true,
-                          "backgroundColor": "#C0C0C0",
-                          "transform": [
-                            [1, 0, 0, 0],
-                            [0, 1, 0, 0],
-                            [0, 0, 1, 0],
-                            [0, 0, 1, 1]
-                          ]
-                        }
-                      ]
-                    }
-                  ]
-                }
-              ]
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}
-