[whatwg/xhr] Should setting an invalid value to responseType on an XHR in LOADING/DONE state throw? (#102)

The spec is not clear when the steps should be run.

https://heycam.github.io/webidl/#dfn-enumeration-value

> In the ECMAScript binding, assignment of an invalid string value to an attribute is ignored

Should we consider
- that the steps in the XHR spec are run only when the value is valid and therefore not ignored
- or that the steps in the XHR spec are run anyway, and invalid values are ignored in the step 4

(The interop issue was originally reported by Ali of Microsoft)

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