Re: [w3c/permissions] Using Web IDL to describe WebDriver JSON is a bit unusual (#174)

I'm not sure if I'm reading https://w3c.github.io/webdriver/#processing-model correctly, but I see:

> Let parse result be the result of [[parsing as JSON](https://w3c.github.io/webdriver/#dfn-parsing-as-json) with request’s body as the argument.
> ...
> let parameters be parse result.
> ...
> running the remote end steps for command with an argument named url variables whose value is url variables and an additional argument named parameters whose value is parameters.

So, I think we *do* start with a Javascript object that's the output of `JSON.parse()`, which it makes sense to use WebIDL on. I hope it's not observable if WebDriver implementations lacking a JS engine go directly from the string to the dictionary object. 

That said, whatwg/infra#159 makes some good points about this being the wrong semantics in some cases. I think I'd weakly vote for keeping the current text until that's resolved, and then switching to it.

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