Reenable DragDropTest.DragDropAcrossMultiDisplay test in debug

crrev.com/c/1893511 fixes the regression in this test caused by
crrev.com/c/1774637.

Test: Verified locally
Bug: 1006101
Change-Id: I2fd04f03a2a11af65a0a8cbeaca17b3d322fc21e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898332
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712640}

ash/drag_drop/drag_drop_unittest.cc

@@ -117,13 +117,7 @@ using DragDropTest = AshTestBase;
 
 // Test if the mouse gets moved properly to another display
 // during drag & drop operation.
-// Fails in debug builds, crbug.com/1006101.
-#if !defined(NDEBUG)
-#define MAYBE_DragDropAcrossMultiDisplay DISABLED_DragDropAcrossMultiDisplay
-#else
-#define MAYBE_DragDropAcrossMultiDisplay DragDropAcrossMultiDisplay
-#endif
-TEST_F(DragDropTest, MAYBE_DragDropAcrossMultiDisplay) {
+TEST_F(DragDropTest, DragDropAcrossMultiDisplay) {
   ui_controls::InstallUIControlsAura(test::CreateAshUIControls());
 
   UpdateDisplay("400x400,400x400");