Sheriff: Re-disable flaky test

It seems the test was re-enabled in https://crrev.com/c/3629759,
however, it seems still flaky.

(cherry picked from commit 4d4fbb9)

Bug: 1113901,1325188
Change-Id: Iefb6a922462a875fde8897e683e74a03ae1c9ec2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3647127
Auto-Submit: Hayato Ito <hayato@chromium.org>
Owners-Override: Hayato Ito <hayato@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1002980}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3650936
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Joe Downing <joedow@chromium.org>
Owners-Override: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#16}
Cr-Branched-From: b83393d-refs/heads/main@{#1002911}

ash/wm/window_animations_unittest.cc

@@ -493,7 +493,8 @@ TEST_F(WindowAnimationsTest, ResetAnimationAfterDismissingArcPip) {
 // opacity of the new layer, but only the opacity of the old layer. The old
 // layer transform is updated manually when the animation ticks so that it
 // has the same visible bounds as the new layer.
-TEST_F(WindowAnimationsTest, CrossFadeAnimateNewLayerOnly) {
+// Flaky on Chrome OS. https://crbug.com/1113901
+TEST_F(WindowAnimationsTest, DISABLED_CrossFadeAnimateNewLayerOnly) {
   ui::ScopedAnimationDurationScaleMode test_duration_mode(
       ui::ScopedAnimationDurationScaleMode::NORMAL_DURATION);