Re: [whatwg/url] Web reality: Filenames should be newline-normalized in urlencoded (#562)

A `FormData` populated from script already doesn't perform any normalization, so you can end up with a `multipart/form-data` with `\n` rather than `\r\n` in the names. (This per the spec and Chrome's behavior; Firefox and WebKit seem to [normalize when serializing](https://wpt.fyi/results/FileAPI/file/send-file-formdata-controls.tentative.html) rather than [when constructing the entry list](https://wpt.fyi/results/html/semantics/forms/form-submission-0/newline-normalization.html).)

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