[whatwg/xhr] Regression fix: need transmitted/length defined before progress event dispatch (#121)

Regressed in 01da69fb27d10a3315f9bf8259cc7074713379ee.

Fixes #116.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/121

-- Commit Summary --

  * Regression fix: need transmitted/length defined before progress event dispatch

-- File Changes --

    M xhr.bs (14)

-- Patch Links --

https://github.com/whatwg/xhr/pull/121.patch
https://github.com/whatwg/xhr/pull/121.diff

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