Re: [whatwg/streams] Don't error an errored WritableStream on messageerror (#1069)

Elaborating on the testing issue, I have been unable to find a cross-browser method to cause a messageerror event. RTCCertificate posted to a Worker should cause a messageerror by the standard because it is a Window-only type, but in practice in Chrome lets you send it to a Worker anyway. SharedArrayBuffer might be a viable option in future, but is not currently practical.

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