cros: Remove some OS platform ifdefs from ash

ash/drag_drop/drag_drop_interactive_uitest.cc

Index: ash/drag_drop/drag_drop_interactive_uitest.cc
diff --git a/ash/drag_drop/drag_drop_interactive_uitest.cc b/ash/drag_drop/drag_drop_interactive_uitest.cc
index 6464edeea2d00f021240ddfe11516edad95e5210..886d186d8f7082d441875c62b21ac3efc45f5c95 100644
--- a/ash/drag_drop/drag_drop_interactive_uitest.cc
+++ b/ash/drag_drop/drag_drop_interactive_uitest.cc
@@ -113,15 +113,9 @@ void DragDropAcrossMultiDisplay_Step1() {
 
 using DragDropTest = test::AshInteractiveUITestBase;
 
-#if !defined(OS_CHROMEOS)
-#define MAYBE_DragDropAcrossMultiDisplay DISABLED_DragDropAcrossMultiDisplay
-#else
-#define MAYBE_DragDropAcrossMultiDisplay DragDropAcrossMultiDisplay
-#endif
-
 // Test if the mouse gets moved properly to another display
 // during drag & drop operation.
-TEST_F(DragDropTest, MAYBE_DragDropAcrossMultiDisplay) {
+TEST_F(DragDropTest, DragDropAcrossMultiDisplay) {
   if (!SupportsMultipleDisplays())
     return;