[whatwg/fetch] Is a missing HeadersInit treated differently from an empty one? (#479)

The relevant IDL is:

    dictionary ResponseInit {
      HeadersInit headers;
    };
    typedef (sequence<sequence<ByteString>> or record<ByteString, ByteString>) HeadersInit;
    
Is passing `{}` for `ResponseInit` equivalent to passing `{ headers: {} }`?  I can't quite tell from the steps at <https://fetch.spec.whatwg.org/#dom-response>.  In particular, is step 6.1 needed?  If it is, chances are those two forms are not identical at the moment....

/cc @wanderview @annevk 

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