[whatwg/fetch] Add potential destination. (#547)

Add a potential destination definition and processing, to enable preload
processing to decouple the `as` value from `destination` to enable
preloading the empty destination using the `fetch` keyword.

This is an alternative solution to https://github.com/whatwg/fetch/pull/442 as discussed in https://github.com/whatwg/fetch/pull/442#discussion_r103624566
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/547

-- Commit Summary --

  * Add potential destination.

-- File Changes --

    M fetch.bs (12)

-- Patch Links --

https://github.com/whatwg/fetch/pull/547.patch
https://github.com/whatwg/fetch/pull/547.diff

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