[whatwg/streams] Remove optional from chunk parameter in QueuingStrategySize (#1164)

The `QueuingStrategySize` callback type is currently defined as:
```
callback QueuingStrategySize = unrestricted double (optional any chunk);
```

I don't think the `optional` should be there? The stream implementation must always pass a value for `chunk` (although the chunk itself *could* still be `undefined` if the user did `controller.enqueue(undefined)` or `writer.write(undefined)`).

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1164


-- Commit Summary --

  * Remove optional from chunk parameter in QueuingStrategySize

-- File Changes --

    M index.bs (2)
    M reference-implementation/lib/QueuingStrategy.webidl (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1164.patch

https://github.com/whatwg/streams/pull/1164.diff


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