Re: [heycam/webidl] Fix internal methods that only target platform objects w/ indexed/named props (#202)

Just to clarify: my initial understanding that these methods (in 3.8) are only defined for platform objects that support indexed/named props is correct, right? Other platform objects that don't support index/named props just use whatever [[X]] method is defined in ECMAScript, right?

So for consistency, shouldn't the platform object [[[PreventExtensions]] method](https://heycam.github.io/webidl/#preventextensions), which we just added, be redefined as such:

```
The internal [[PreventExtensions]] method of every platform object that
implements an interface which supports indexed or named properties,
must behave as follows:

1. return false.
```





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