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

I think that @domenic desires to see __a very short way__ to check if a custom element was defined or not. What about if
```javascript
var check = document.querySelector('my-custom-element');
if (check) {
  console.log('my-custom-element already defined');
}
```
So, if defined _check_ won't be null.
In that way we don't need to add a new concept like a list or registry of defined custom elements.


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