Re: [streams] Introduce readable stream controller class (#310)

Took a look at all the diff lines. I'm not sure if there some `t.throws` based tests remain not-converted since even if you forget to update, the function may throw a **TypeError** for example if the function is set to **undefined** by mistake.

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https://github.com/whatwg/streams/pull/310#issuecomment-88054467