[whatwg/xhr] Set Fetch's legacySpaceFlag for setRequestHeader() (#129)

Depends on https://github.com/whatwg/fetch/issues/501. Tests have been
updated already.

Fixes #108.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/129

-- Commit Summary --

  * Set Fetch's legacySpaceFlag for setRequestHeader()

-- File Changes --

    M xhr.bs (4)

-- Patch Links --

https://github.com/whatwg/xhr/pull/129.patch
https://github.com/whatwg/xhr/pull/129.diff

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