Re: [whatwg/xhr] Make FormData a cloneable object (#55)

Well,
```js
onmessage = e => console.log(e.data)
postMessage(new FormData(),"*");
```
does log a `FormData` object in Firefox Nightly and an exception in Chrome Canary. However, the serialization steps for a given platform object are also passed a _forStorage_ boolean. I suspect Firefox throws if that is true, based on your analysis.

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