Enable universal accelerated overflow scroll

LayoutTests/platform/mac-snowleopard/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt

Index: LayoutTests/platform/mac-snowleopard/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt
diff --git a/LayoutTests/platform/mac-snowleopard/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt b/LayoutTests/platform/mac-snowleopard/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt
deleted file mode 100644
index 6e45d7f988389225ce4fcafb778f28d76e34aab5..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac-snowleopard/compositing/overflow/composited-scrolling-creates-a-stacking-container-expected.txt
+++ /dev/null
@@ -1,59 +0,0 @@
-(GraphicsLayer
-  (bounds 800.00 600.00)
-  (children 1
-    (GraphicsLayer
-      (bounds 800.00 600.00)
-      (contentsOpaque 1)
-      (drawsContent 1)
-      (children 1
-        (GraphicsLayer
-          (position 28.00 20.00)
-          (bounds 202.00 202.00)
-          (drawsContent 1)
-          (children 4
-            (GraphicsLayer
-              (position 1.00 1.00)
-              (bounds 185.00 185.00)
-              (children 1
-                (GraphicsLayer
-                  (bounds 200.00 300.00)
-                  (shouldFlattenTransform 0)
-                  (drawsContent 1)
-                  (children 2
-                    (GraphicsLayer
-                      (bounds 200.00 300.00)
-                      (drawsContent 1)
-                    )
-                    (GraphicsLayer
-                      (bounds 200.00 150.00)
-                      (contentsOpaque 1)
-                      (drawsContent 1)
-                      (backgroundColor #008000)
-                    )
-                  )
-                )
-              )
-            )
-            (GraphicsLayer
-              (position 1.00 186.00)
-              (bounds 185.00 15.00)
-              (drawsContent 1)
-            )
-            (GraphicsLayer
-              (position 186.00 1.00)
-              (bounds 15.00 185.00)
-              (drawsContent 1)
-            )
-            (GraphicsLayer
-              (position 186.00 186.00)
-              (bounds 15.00 15.00)
-              (drawsContent 1)
-            )
-          )
-        )
-      )
-    )
-  )
-)
-
-