mash: Remove shelf app menu item objects.

ash/common/shelf/shelf_item_delegate.h

Index: ash/common/shelf/shelf_item_delegate.h
diff --git a/ash/common/shelf/shelf_item_delegate.h b/ash/common/shelf/shelf_item_delegate.h
index ce7dd17c3e6549e8a99eef6e98c731ff5d537592..8ff4aed52bc2d1fac6bf9f76be34cf8c19bf2dc7 100644
--- a/ash/common/shelf/shelf_item_delegate.h
+++ b/ash/common/shelf/shelf_item_delegate.h
@@ -5,6 +5,8 @@
 #ifndef ASH_COMMON_SHELF_SHELF_ITEM_DELEGATE_H_
 #define ASH_COMMON_SHELF_SHELF_ITEM_DELEGATE_H_
 
+#include <stdint.h>
+
 #include "ash/ash_export.h"
 #include "ash/public/cpp/shelf_application_menu_item.h"
 #include "ash/public/cpp/shelf_types.h"
@@ -35,6 +37,9 @@ class ASH_EXPORT ShelfItemDelegate {
   // |event_flags| specifies the flags of the event which triggered this menu.
   virtual ShelfAppMenuItemList GetAppMenuItems(int event_flags) = 0;
 
+  // Called on invocation of a shelf item's application menu command.
+  virtual void ExecuteCommand(uint32_t command_id, int event_flags) = 0;
+
   // Closes all windows associated with this item.
   virtual void Close() = 0;