[whatwg/fetch] Change combine to be compatible with XMLHttpRequest implementations (#504)

Fixes part of https://github.com/whatwg/xhr/issues/108.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/504

-- Commit Summary --

  * Change combine to be compatible with XMLHttpRequest implementations

-- File Changes --

    M fetch.bs (16)

-- Patch Links --

https://github.com/whatwg/fetch/pull/504.patch
https://github.com/whatwg/fetch/pull/504.diff

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