[whatwg/streams] Remove TransformStream _transforming member (#788)

The _transforming member of TransformStream was used to keep track of
whether a call to transformer.transform() was currently in progress.

The diagnostic value it provided was minimal, and it served no other
purpose, so remove it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/788

-- Commit Summary --

  * Remove TransformStream _transforming member

-- File Changes --

    M reference-implementation/lib/transform-stream.js (18)

-- Patch Links --

https://github.com/whatwg/streams/pull/788.patch
https://github.com/whatwg/streams/pull/788.diff

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