Comment 1 for bug 1256973

as of http://bazaar.launchpad.net/~openupgrade-committers/openupgrade-addons/7.0/view/head:/document_ftp/migrations/7.0.1.99/openupgrade_analysis.txt, this is indeed something yet to be done.

For the time being, you can delete the record with name
action_document_browse
frmo your ir_model_data

Please be aware that the migration for 7.0 is far from finished, so ymmv