Cleanup after enabling all slimming paint for all layout tests

LayoutTests/virtual/slimmingpaint/compositing/squashing/repaint-via-layout-offset-expected.txt

Index: LayoutTests/virtual/slimmingpaint/compositing/squashing/repaint-via-layout-offset-expected.txt
diff --git a/LayoutTests/virtual/slimmingpaint/compositing/squashing/repaint-via-layout-offset-expected.txt b/LayoutTests/virtual/slimmingpaint/compositing/squashing/repaint-via-layout-offset-expected.txt
deleted file mode 100644
index af26bb8b99d825faeaf93f4a73ef3a1fe847c748..0000000000000000000000000000000000000000
--- a/LayoutTests/virtual/slimmingpaint/compositing/squashing/repaint-via-layout-offset-expected.txt
+++ /dev/null
@@ -1,37 +0,0 @@
-{
-  "bounds": [800, 600],
-  "children": [
-    {
-      "bounds": [800, 600],
-      "contentsOpaque": true,
-      "drawsContent": true,
-      "children": [
-        {
-          "shouldFlattenTransform": false,
-          "children": [
-            {
-              "position": [8, 8],
-              "bounds": [200, 200],
-              "contentsOpaque": true,
-              "drawsContent": true,
-              "backgroundColor": "#ADD8E6"
-            },
-            {
-              "position": [50, 50],
-              "bounds": [50, 50],
-              "drawsContent": true,
-              "repaintRects": [
-                [0, 0, 50, 50],
-                [0, 0, 40, 40]
-              ],
-              "paintInvalidationClients": [
-                "LayoutBlockFlow (positioned) SPAN class='child embiggen'"
-              ]
-            }
-          ]
-        }
-      ]
-    }
-  ]
-}
-