Make WmShellMus use classic types for mus

ash/wm/window_cycle_event_filter_aura.h

Index: ash/wm/window_cycle_event_filter_aura.h
diff --git a/ash/wm/window_cycle_event_filter_aura.h b/ash/wm/window_cycle_event_filter_aura.h
index eb567f62b7a7f1415d6a2214e9e7e73e0c6639fe..fce26d83ec3c5804c548467c0b0dfec7d9b5fe06 100644
--- a/ash/wm/window_cycle_event_filter_aura.h
+++ b/ash/wm/window_cycle_event_filter_aura.h
@@ -5,6 +5,7 @@
 #ifndef ASH_WM_WINDOW_CYCLE_EVENT_FILTER_AURA_H_
 #define ASH_WM_WINDOW_CYCLE_EVENT_FILTER_AURA_H_
 
+#include "ash/ash_export.h"
 #include "ash/common/wm/window_cycle_event_filter.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
@@ -12,8 +13,8 @@
 
 namespace ash {
 
-class WindowCycleEventFilterAura : public ui::EventHandler,
-                                   public WindowCycleEventFilter {
+class ASH_EXPORT WindowCycleEventFilterAura : public ui::EventHandler,
+                                              public WindowCycleEventFilter {
  public:
   WindowCycleEventFilterAura();
   ~WindowCycleEventFilterAura() override;