Converts ash to use aura-mus

ash/wm/event_client_impl.h

Index: ash/wm/event_client_impl.h
diff --git a/ash/wm/event_client_impl.h b/ash/wm/event_client_impl.h
index 1fa176e749a28be75d83e9113f53257f207ee09b..188b76ffb074d51b0a96c368e7c4ce7387884268 100644
--- a/ash/wm/event_client_impl.h
+++ b/ash/wm/event_client_impl.h
@@ -6,13 +6,12 @@
 #define ASH_WM_EVENT_CLIENT_IMPL_H_
 
 #include "ash/ash_export.h"
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/aura/client/event_client.h"
 
 namespace ash {
 
-class EventClientImpl : public aura::client::EventClient {
+class ASH_EXPORT EventClientImpl : public aura::client::EventClient {
  public:
   EventClientImpl();
   ~EventClientImpl() override;