[whatwg/url] Restrict setting protocol to "file" (#269)

As file URLs cannot have username/password/port we don’t want to allow
changing the scheme of a URL that contains one or more of those
components.

Fixes #259.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/269

-- Commit Summary --

  * Restrict setting protocol to "file"

-- File Changes --

    M url.bs (3)

-- Patch Links --

https://github.com/whatwg/url/pull/269.patch
https://github.com/whatwg/url/pull/269.diff

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