Function webkit2gtk_sys::webkit_web_view_run_javascript_in_world_finish

pub unsafe extern "C" fn webkit_web_view_run_javascript_in_world_finish(
    web_view: *mut WebKitWebView, 
    result: *mut GAsyncResult, 
    error: *mut *mut GError
) -> *mut WebKitJavascriptResult

This is supported on crate feature v2_22 only.