[whatwg/fetch] Fixing variable definitions and scoping. Fixes #706. (#749)

I used [this horrible piece of code](https://gist.github.com/jakearchibald/ceb666e0a9271b55cd48d07dac2b74b6) (run in the console) to identify variables that weren't correctly defined.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/749

-- Commit Summary --

  * Fixing variable definitions and scoping. Fixes #706.

-- File Changes --

    M fetch.bs (18)

-- Patch Links --

https://github.com/whatwg/fetch/pull/749.patch
https://github.com/whatwg/fetch/pull/749.diff

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