erp5_ingestion: Remove hack from Base_contribute

bt5/erp5_ingestion/SkinTemplateItem/portal_skins/erp5_ingestion/Base_contribute.py

@@ -50,11 +50,6 @@ if attach_document_to_context:
   document_kw['follow_up_list'] = follow_up_list
 
 document_kw.update({'discover_metadata': not synchronous_metadata_discovery})
-
-# With extra_document_kw you can pass properties
-# used to create a new document in ERP5, like filename
-document_kw.update(extra_document_kw)
-
 if url is not None:
   # we contribute and URL, this happens entirely asynchronous
   document = portal_contributions.newContentFromURL(url = url, \