Revert 153291 - Fixes crash introduced @ 153047 (you can hit crash by maximizing a

ash/wm/window_animations.h

Index: ash/wm/window_animations.h
===================================================================
--- ash/wm/window_animations.h	(revision 153309)
+++ ash/wm/window_animations.h	(working copy)
@@ -119,6 +119,10 @@
 ASH_EXPORT bool AnimateOnChildWindowVisibilityChanged(
     aura::Window* window, bool visible);
 
+// Delay the old layer deletion so that test can verify the behavior of
+// old layer.
+ASH_EXPORT void SetDelayedOldLayerDeletionInCrossFadeForTest(bool value);
+
 }  // namespace internal
 }  // namespace ash