When a new ARIA group role is added, both AccessibilityObjectWrapper.mm and WebViewFactory.mm will need to be updated to provide a new description string for the new role. But because -[WebViewFactory AXARIAContentGroupText:] takes a string parameter describing the role, it will be easy to forget to update both places (e.g., someone could update AccessibilityObjectWrapper.mm but forget to update WebViewFactory.mm). This would be less fragile if we had a separate WebViewFactory method for each ARIA group role, rather than a single method that takes the role as a parameter. A side benefit of this is that all other ports will be aware of all the role description strings they need to provide, rather than having to look at WebViewFactory.mm to figure it out.