Re: [whatwg/fetch] OpenEndedDictionary clarification (#164)

Currently the semantics of this type is a bit confused even among browser vendors. Take for example, the following code fragment:

```js
const a = Object.create({
  three: 'three'
});
Object.defineProperties(a, {
  one: {enumerable: true, value: 'one'},
  two: {enumerable: false, value: 'two'}
});
const h = new Headers(a);
console.log(h.get('one'));
console.log(h.get('two'));
console.log(h.get('three'));
```

On Chrome 54.0.2840.34 (Official Build) beta (64-bit), the code results in 

```
one
null
three
```

On Firefox 49.0b1:

```
one
null
null
```

Using the albeit outdated [github/fetch](https://github.com/github/fetch) polyfill:

```
one
two
null
```

It'd be the best if this issue could be resolved speedily. Thanks

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