[heycam/webidl] [[Construct]] for legacy platform objects? (#407)

On a page with `#title`:

```js
new document.all('title')
```

In Chrome the snippet returns the same result as `document.all('title')`, while on Firefox the following error is thrown:

```
TypeError: document.all is not a constructor
```

[[Construct]] is technically undefined by this spec right now, so either behavior is strictly speaking acceptable. However, the Chrome behavior doesn't make much sense to me, so I'd like to propose a dedicated section for [[Construct]] saying that it does not exist for legacy platform objects.

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