Re: [whatwg/streams] SetUpReadableStreamDefaultControllerFromUnderlyingSource algorithm takes an extra argument controller that isn't provided at callsite. (#1151)

Good catch, thanks for reporting!

The first step of `SetUpReadableStreamDefaultControllerFromUnderlyingSource` is:
> 1. Let *controller* be a new `ReadableStreamDefaultController`.

so it looks like we should *remove* the `controller` argument, rather than update the call site. 🙂

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