Protect AppListItemList Add/Remove and fix sync bugs

ui/app_list/app_list_item_list.h

Index: ui/app_list/app_list_item_list.h
diff --git a/ui/app_list/app_list_item_list.h b/ui/app_list/app_list_item_list.h
index d52acf2c8bee3bf9d401c3a51b208d8673e106e6..a5fa15263a6ffa09f3d65c2bfeb2eea3c5a8fafe 100644
--- a/ui/app_list/app_list_item_list.h
+++ b/ui/app_list/app_list_item_list.h
@@ -37,25 +37,39 @@ class APP_LIST_EXPORT AppListItemList {
   // Note: Requires a linear search.
   bool FindItemIndex(const std::string& id, size_t* index);
 
+  // Moves item at |from_index| to |to_index|.
+  // Triggers observers_.OnListItemMoved().
+  void MoveItem(size_t from_index, size_t to_index);
+
+  // Sets the position of |item| which is expected to be a member of
+  // |app_list_items_| and sorts the list accordingly.
+  void SetItemPosition(AppListItem* item,
+                       const syncer::StringOrdinal& new_position);
+
+  AppListItem* item_at(size_t index) {
+    DCHECK_LT(index, app_list_items_.size());
+    return app_list_items_[index];
+  }
+  const AppListItem* item_at(size_t index) const {
+    DCHECK_LT(index, app_list_items_.size());
+    return app_list_items_[index];
+  }
+  size_t item_count() const { return app_list_items_.size(); }
+
+ private:
+  friend class AppListItemListTest;
+  friend class AppListModel;
+  friend class AppListModelTest;  // TODO(stevenjb): Remove dependency
+
   // Adds |item| to the end of |app_list_items_|. Takes ownership of |item|.
   // Triggers observers_.OnListItemAdded(). Returns the index of the added item.
   size_t AddItem(AppListItem* item);
 
-  // Inserts |item| at the |index| into |app_list_items_|. Takes ownership of
-  // |item|. Triggers observers_.OnListItemAdded().
-  void InsertItemAt(AppListItem* item, size_t index);
-
   // Finds item matching |id| in |app_list_items_| (linear search) and deletes
   // it. Triggers observers_.OnListItemRemoved() after removing the item from
   // the list and before deleting it.
   void DeleteItem(const std::string& id);
 
-  // Deletes all items matching |type| which must be a statically defined
-  // type descriptor, e.g. AppListFolderItem::kItemType. If |type| is NULL,
-  // deletes all items. Triggers observers_.OnListItemRemoved() for each item
-  // as for DeleteItem.
-  void DeleteItemsByType(const char* type);
-
   // Removes the item with matching |id| in |app_list_items_| without deleting
   // it. Returns a scoped pointer containing the removed item.
   scoped_ptr<AppListItem> RemoveItem(const std::string& id);
@@ -64,22 +78,6 @@ class APP_LIST_EXPORT AppListItemList {
   // Returns a scoped pointer containing the removed item.
   scoped_ptr<AppListItem> RemoveItemAt(size_t index);
 
-  // Moves item at |from_index| to |to_index|.
-  // Triggers observers_.OnListItemMoved().
-  void MoveItem(size_t from_index, size_t to_index);
-
-  // Sets the position of |item| which is expected to be a member of
-  // |app_list_items_| and sorts the list accordingly.
-  void SetItemPosition(AppListItem* item,
-                       const syncer::StringOrdinal& new_position);
-
-  AppListItem* item_at(size_t index) {
-    DCHECK_LT(index, app_list_items_.size());
-    return app_list_items_[index];
-  }
-  size_t item_count() const { return app_list_items_.size(); }
-
- private:
   // Deletes item at |index| and signals observers.
   void DeleteItemAt(size_t index);