[whatwg/url] Should protocol setter remove tabs and newline? (#609)

Consider the following test:

```js
u = new URL("https://github.com/whatwg/url/issues/new");
u.protocol = "ht\ntp";
u.href
```

On Chrome, Firefox, and Safari, `u.href` retains the original `https` protocol. This behavior as it relates to the Location object is in fact tested by WPT(!): search for `\x0A` in [html/browsers/history/the-location-interface/location-protocol-setter.html](https://github.com/web-platform-tests/wpt/blob/master/html/browsers/history/the-location-interface/location-protocol-setter.html#L48).

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