[giow] (3) Oops, looks like kind=metadata tracks have been technically supposed to render this whole time
Affected topics: Rendering

git-svn-id: http://svn.whatwg.org/webapps@7952 340c8d12-0b0e-0410-8428-c7bf67bfef74

Author:    ianh <ianh@340c8d12-0b0e-0410-8428-c7bf67bfef74>