[whatwg/fetch] Copy priority so service worker pass-through requests don't lose it (#785)

H2 priorities are lost when passing through a service worker. https://medium.baqend.com/chromes-service-workers-break-http-2-priorities-649c4e0fa930

Although priorities are hand-wavy right now, it seems right to copy them from one request to another. 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/785

-- Commit Summary --

  * Copy priority so service worker pass-through requests don't lose it

-- File Changes --

    M fetch.bs (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/785.patch
https://github.com/whatwg/fetch/pull/785.diff

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