[heycam/webidl] What does FrozenArray mean in dictionaries? (#900)

[Web Share](https://w3c.github.io/web-share/#sharedata-dictionary) has this dictionary:

```webidl
dictionary ShareData {
  FrozenArray<File> files;
  USVString title;
  USVString text;
  USVString url;
};
```

I guess it has nothing special as a dictionary member or as an argument. Should this be prevented to clarify things?

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