Re: [webcomponents] Permit retrieval of registered classes from window.customElements (#445)

@domenic This looks rather inconsistent to me:

```js
if (window.HTMLPictureElement) {
  let picture = document.createElement("picture");
}
```

.... compared to:

```js
if (document.elements.has("picture")) {
  let picture = document.elements.create("picture");
}
```

... or:

```js
if (window.HTMLPictureElement) {
  let picture = new HTMLPictureElement();
}
````

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