[whatwg/url] Allow protocol setter to switch between special and non-special schemes (Issue #674)

Chrome, Firefox, and Safari all agree on this behavior:

`u = new URL("custom-scheme://host?initially-no-path");`
`u.protocol = "https";`
`u.protocol = "custom-scheme";`
`u.href; // custom-scheme://host/?initially-no-path`

Even though it is a little strange, I have reason to believe that people are using the URL protocol setter to do this already.

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https://github.com/whatwg/url/issues/674