Re: [w3c/webcomponents] [idea] making builtin elements more like custom elements (#785)

The way built-in elements work is similar to the following code:

```js
class SomeBuiltinElement {
  connectedCallback() {
    // do something
  }
}

// This call causes the system to store SomeBuiltinElement.prototype.connectedCallback for later use.
customElements.define('somebuiltinelement', SomeBuiltinElement);

// But, it's not accessible to users.
delete SomeBuiltinElement.prototype.connectedCallback;
```

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