[whatwg/url] Let webkitURL be an alias of the URL constructor (#135)

Measuring usage of attributes on the global object is hard because it's tainted by enumeration, but this is what we have:
https://www.chromestatus.com/metrics/feature/timeline/popularity/283

(Compare to https://www.chromestatus.com/metrics/feature/timeline/popularity/356 which is likely used very little but is also at ~0.1%.)

`window.webkitURL` has been deprecated in Blink for a long time, and I need to either remove it or get rid of the deprecation message. I'm leaning towards just spec'ing it, because Edge has `window.webkitURL` and it's trivial to support if you also have the infrastructure for other constructor aliases like `WebKitAnimationEvent` or, perhaps, `HTMLDocument` as an alias of `Document` (not yet implemented).

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