Re: [whatwg/streams] Lookup methods in constructors (#860)

I would be happier if I knew why the ES version of GetMethod squashes `null` to `undefined`. I can't make sense of it.
```javascript
new TransformStream({
  transform: null
});
```
doesn't look like a sensible way to create an identity transform, it just looks like nonsense to me. It's not like we intend for people to write `{ transform: undefined }`, there's just no point in disallowing it.

So, in the absence of a compelling justification for squashing `null` to `undefined`, I'd prefer to keep our existing semantics. I plan to proceed with option 4: inline GetMethod as it's only used in two places anyway.

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