[whatwg/xhr] Aborted flag check in "handle errors" (Issue #355)

It seems that this step in "handle errors" is redundant:
> 3. Otherwise, if xhr’s response’s aborted flag is set, run the request error steps for xhr, abort, and "AbortError" DOMException.

A call to `abort()` unsets the `send() flag` via the "request error steps". This means that any future execution of "handle errors", before `open()` is called again, will immediately return:
> 1. If xhr’s send() flag is unset, then return.

Step 3 that checks the `aborted flag` will therefore never run, assuming the only way for the `aborted flag` to be set is to call `abort()`, Perhaps there is another way to set the `aborted flag` of an `XMLHttpRequest`'s response, but I couldn't spot it. Or is this unreachable step a way to future proof "handle errors" ?

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