Revert "add methods from content_entries_service to content_entry_service and remove content_entries_service"

This reverts commit 5ec7bd025dccac787dd58f97600180e27e5922d4.
Revert 5ec7bd0..9346510

This rolls back to commit 5ec7bd025dccac787dd58f97600180e27e5922d4.