After uninstall, remove last item in Launcher folder

ui/app_list/views/apps_grid_view.h

 // Copyright (c) 2012 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 UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 #define UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_
 
 #include <set>
 #include <string>
 
@@ skipping 179 matching lines @@
       bool cancel_drag);
 
   // Handles EndDrag event in the hidden folder grid view to end reparenting
   // a folder item.
   void EndDragForReparentInHiddenFolderGridView();
 
   // Called when the folder item associated with the grid view is removed.
   // The grid view must be inside a folder view.
   void OnFolderItemRemoved();
 
+  // If there is only 1 item left in the source folder after reparenting an item
+  // from it, updates both data model and view_model_ for removing last item
+  // from the source folder and removes the source folder.
+  void RemoveLastItemFromReparentItemFolderIfNecessary(
+      const std::string& source_folder_id);
+
   // Return the view model for test purposes.
   const views::ViewModelT<AppListItemView>* view_model_for_test() const {
     return &view_model_;
   }
 
   // For test: Return if the drag and drop handler was set.
   bool has_drag_and_drop_host_for_test() {
     return nullptr != drag_and_drop_host_;
   }
 
@@ skipping 137 matching lines @@
 
   // Updates both data model and view_model_ for re-parenting a folder item to a
   // new position in top level item list.
   void ReparentItemForReorder(AppListItemView* item_view, const Index& target);
 
   // Updates both data model and view_model_ for re-parenting a folder item
   // to anther folder target. Returns whether the reparent succeeded.
   bool ReparentItemToAnotherFolder(AppListItemView* item_view,
                                    const Index& target);
 
-  // If there is only 1 item left in the source folder after reparenting an item
-  // from it, updates both data model and view_model_ for removing last item
-  // from the source folder and removes the source folder.
-  void RemoveLastItemFromReparentItemFolderIfNecessary(
-      const std::string& source_folder_id);
-
   // If user does not drop the re-parenting folder item to any valid target,
   // cancel the re-parenting action, let the item go back to its original
   // parent folder with UI animation.
   void CancelFolderItemReparent(AppListItemView* drag_item_view);
 
   // Cancels any context menus showing for app items on the current page.
   void CancelContextMenusOnCurrentPage();
 
   // Removes the AppListItemView at |index| in |view_model_| and deletes it.
   void DeleteItemViewAtIndex(int index);
@@ skipping 201 matching lines @@
 
   // True if the drag_view_ item is a folder item being dragged for reparenting.
   bool dragging_for_reparent_item_;
 
   DISALLOW_COPY_AND_ASSIGN(AppsGridView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APPS_GRID_VIEW_H_