[whatwg/url] Perhaps do not apply ToASCII for ASCII-only input (#267)

See https://lists.w3.org/Archives/Public/www-archive/2017Feb/0006.html

The possible solutions are:

- Browsers get stricter and apply ToASCII anyway
- ToASCII's definition changes to not do any validation on ASCII-only input
- This spec only invokes ToASCII on on non-ASCII input

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https://github.com/whatwg/url/issues/267