mash: Use mojo for ShelfItemDelegate and [app] MenuItem.

ash/common/shelf/app_list_shelf_item_delegate.h

Index: ash/common/shelf/app_list_shelf_item_delegate.h
diff --git a/ash/common/shelf/app_list_shelf_item_delegate.h b/ash/common/shelf/app_list_shelf_item_delegate.h
index 88f09d27a2c2f69c15e822b1c9d4a2c2d08cb0ee..25f01f2c5699caa01a616dc685458ebed626b606 100644
--- a/ash/common/shelf/app_list_shelf_item_delegate.h
+++ b/ash/common/shelf/app_list_shelf_item_delegate.h
@@ -22,12 +22,11 @@ class AppListShelfItemDelegate : public ShelfItemDelegate {
   ~AppListShelfItemDelegate() override;
 
   // ShelfItemDelegate:
-  ShelfAction ItemSelected(ui::EventType event_type,
-                           int event_flags,
-                           int64_t display_id,
-                           ShelfLaunchSource source) override;
-  ShelfAppMenuItemList GetAppMenuItems(int event_flags) override;
-  void ExecuteCommand(uint32_t command_id, int event_flags) override;
+  void ItemSelected(std::unique_ptr<ui::Event> event,
+                    int64_t display_id,
+                    ShelfLaunchSource source,
+                    const ItemSelectedCallback& callback) override;
+  void ExecuteCommand(uint32_t command_id, int32_t event_flags) override;
   void Close() override;
 
  private: