Revert of Make TrayDetailsView a ViewClickListener and ButtonListener

ash/common/system/tray/view_click_listener.h

Index: ash/common/system/tray/view_click_listener.h
diff --git a/ash/common/system/tray/view_click_listener.h b/ash/common/system/tray/view_click_listener.h
index 09f1aede1cc45eed6c7cc9a4e702d4dfe7903053..f1e2ca2790fedf1fee7c4d003261cc342a390623 100644
--- a/ash/common/system/tray/view_click_listener.h
+++ b/ash/common/system/tray/view_click_listener.h
@@ -5,15 +5,13 @@
 #ifndef ASH_COMMON_SYSTEM_TRAY_VIEW_CLICK_LISTENER_H_
 #define ASH_COMMON_SYSTEM_TRAY_VIEW_CLICK_LISTENER_H_
 
-#include "ash/ash_export.h"
-
 namespace views {
 class View;
 }
 
 namespace ash {
 
-class ASH_EXPORT ViewClickListener {
+class ViewClickListener {
  public:
   virtual void OnViewClicked(views::View* sender) = 0;