Create from regular info object.

def from_obj(cls, container, file_obj):
        """Create from regular info object."""
        # RFC 1123: Thu, 07 Jun 2007 18:57:07 GMT
        return cls(container,
                   name=file_obj.name,
                   size=file_obj.size,
                   content_type=file_obj.content_type,
                   last_modified=dt_from_header(file_obj.last_modified),
                   obj_type=cls.choose_type(file_obj.content_type))