Enable universal accelerated overflow scroll

LayoutTests/compositing/overflow/automatically-opt-into-composited-scrolling-part-4-expected.txt

Index: LayoutTests/compositing/overflow/automatically-opt-into-composited-scrolling-part-4-expected.txt
diff --git a/LayoutTests/compositing/overflow/automatically-opt-into-composited-scrolling-part-4-expected.txt b/LayoutTests/compositing/overflow/automatically-opt-into-composited-scrolling-part-4-expected.txt
deleted file mode 100644
index d7347af2ac4e2cee0b7963955a50167e0b519b72..0000000000000000000000000000000000000000
--- a/LayoutTests/compositing/overflow/automatically-opt-into-composited-scrolling-part-4-expected.txt
+++ /dev/null
@@ -1,29 +0,0 @@
-Testing permutation set 3 - this means that the "sibling" will be placed at the index 3 of the paint order.
-PASS iteration 0: opted in, since doing so does not change the stacking order.
-PASS iteration 1: opted in, since doing so does not change the stacking order.
-PASS iteration 2: opted in, since doing so does not change the stacking order.
-PASS iteration 3: opted in, since doing so does not change the stacking order.
-PASS iteration 4: opted in, since doing so does not change the stacking order.
-PASS iteration 5: opted in, since doing so does not change the stacking order.
-PASS iteration 6: did not opt in, since doing so would change the stacking order.
-PASS iteration 7: did not opt in, since doing so would change the stacking order.
-PASS iteration 8: opted in, since doing so does not change the stacking order.
-PASS iteration 9: did not opt in, since doing so would change the stacking order.
-PASS iteration 10: opted in, since doing so does not change the stacking order.
-PASS iteration 11: did not opt in, since doing so would change the stacking order.
-PASS iteration 12: opted in, since doing so does not change the stacking order.
-PASS iteration 13: opted in, since doing so does not change the stacking order.
-PASS iteration 14: opted in, since doing so does not change the stacking order.
-PASS iteration 15: did not opt in, since doing so would change the stacking order.
-PASS iteration 16: did not opt in, since doing so would change the stacking order.
-PASS iteration 17: opted in, since doing so does not change the stacking order.
-PASS iteration 18: did not opt in, since doing so would change the stacking order.
-PASS iteration 19: did not opt in, since doing so would change the stacking order.
-PASS iteration 20: did not opt in, since doing so would change the stacking order.
-PASS iteration 21: did not opt in, since doing so would change the stacking order.
-PASS iteration 22: opted in, since doing so does not change the stacking order.
-PASS iteration 23: opted in, since doing so does not change the stacking order.
-PASS iteration 24: did not opt in, since doing so would change the stacking order.
-PASS iteration 25: did not opt in, since doing so would change the stacking order.
-PASS iteration 26: opted in, since doing so does not change the stacking order.
-