Alternative to org.openjena.riot.WebContent?

Hey,

I'm using constants from org.openjena.riot.WebContent, such as
WebContent.contentTypeRDFXML, WebContent.langRDFXML etc.

After upgrading to Jena 2.11.0 (as part of SPIN API 1.3.1), the
WebContent class is not there anymore. What can I use instead?

Thanks.

Martynas