Re: [whatwg/url] username/password/port should be removed when "file" is added as scheme (#259)

The basis why this behavior should avoid is that it allows having an invalid URL in the `href`:
```js
var url = new URL('http://user:pass@foo.bar.com:21/aaa/zzz?l=24#test');
url.protocol = 'file:';

var url2 = new URL(url.href);
// => Uncaught TypeError: Failed to construct 'URL': Invalid URL
//      at <anonymous>:1:1
//  (anonymous) @ VM326:1
```

As another workaround, it can escape the invalid character strings, but it's more predictable and natural to delete automatically imho because the properties such as `username/password/port` are independent of each other.

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