[whatwg/streams] delete dead code (#602)

These were ported over to web-platform-tests in
commit b68b8964977565001fa9db672bbb20eb1d955568 along with their
last users, but they weren't removed.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/602

-- Commit Summary --

  * delete dead code

-- File Changes --

    D reference-implementation/test/utils/gc.js (16)
    D reference-implementation/test/utils/random-push-source.js (75)

-- Patch Links --

https://github.com/whatwg/streams/pull/602.patch
https://github.com/whatwg/streams/pull/602.diff

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