[whatwg/streams] Test that TransformStream does not use global constructors (#852)

The TransformStream constructor constructs a ReadableStream and
WritableStream. It should use the original constructors rather than what
currently exists on the global object.

Add tests to verify that it does.

Related to issue #850.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/852

-- Commit Summary --

  * Test that TransformStream does not use global constructors

-- File Changes --

    M reference-implementation/to-upstream-wpts/transform-streams/patched-global.js (30)

-- Patch Links --

https://github.com/whatwg/streams/pull/852.patch
https://github.com/whatwg/streams/pull/852.diff

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