[mediacapture-fromelement] Switch to contiguous idl

miguelao has just created a new issue for 
https://github.com/w3c/mediacapture-fromelement:

== Switch to contiguous idl ==
Ominous warning in the ReSpec means that this Spec should be 
transformed to the new thing:

> Defining WebIDL in dl elements is deprecated. Please use Contiguous 
IDL instead: https://www.w3.org/respec/guide.html#contiguous-idl

@dontcallmedom, after doing this transition by hand elsewhere I'm more
 than willing to be shown your conversion script in action :-)



Please view or discuss this issue at 
https://github.com/w3c/mediacapture-fromelement/issues/46 using your 
GitHub account