Function webkit2gtk_sys::webkit_form_submission_request_list_text_fields

pub unsafe extern "C" fn webkit_form_submission_request_list_text_fields(
    request: *mut WebKitFormSubmissionRequest, 
    field_names: *mut *mut GPtrArray, 
    field_values: *mut *mut GPtrArray
) -> gboolean

This is supported on crate feature v2_20 only.