Make WmShellMus use classic types for mus

ash/wm/maximize_mode/maximize_mode_event_handler_aura.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_HANDLER_AURA_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_HANDLER_AURA_H_
 
+#include "ash/ash_export.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_event_handler.h"
 #include "ui/events/event_handler.h"
 
 namespace ash {
 namespace wm {
 
 // Implementation of MaximizeModeEventHandler for aura. Uses ui::EventHandler.
-class MaximizeModeEventHandlerAura : public MaximizeModeEventHandler,
-                                     public ui::EventHandler {
+class ASH_EXPORT MaximizeModeEventHandlerAura : public MaximizeModeEventHandler,
+                                                public ui::EventHandler {
  public:
   MaximizeModeEventHandlerAura();
   ~MaximizeModeEventHandlerAura() override;
 
  private:
   // ui::EventHandler override:
   void OnTouchEvent(ui::TouchEvent* event) override;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeEventHandlerAura);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_HANDLER_AURA_H_