[streams] Some clean up on TransformStream (#332)

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

  https://github.com/whatwg/streams/pull/332

-- Commit Summary --

  * Remove unnecessary variable 'readable' in transform-stream.js
  * Release reference on writeChunk once transform is called

-- File Changes --

    M reference-implementation/lib/transform-stream.js (5)

-- Patch Links --

https://github.com/whatwg/streams/pull/332.patch
https://github.com/whatwg/streams/pull/332.diff

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https://github.com/whatwg/streams/pull/332