Re: [heycam/webidl] Is a subclass still a platform object? (#540)

FWIW, it seems that at least Chrome shifts the relevant global object in that case, see:
```html
.<iframe></iframe>
<script>
class X extends frames[0].EventTarget {};
obj = new X();
obj.addEventListener("hi", () => w(window.event));
obj.dispatchEvent(new Event("hi"));
</script>
```

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