Re: [WICG/webcomponents] Updating Element Registration. (#820)

Support for redefine will make hot replacement easy to implement.

```
class MyElement extends HTMLElement {}
customElements.define('my-element', MyElement);

...
if (customElements.define('my-element')) {
  customElements.redefine('my-element', MyElement2);
  customElements.upgrade(document.documentElement);
}
```


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