Re: [whatwg/dom] [Proposal] Add EventTarget.getEventListeners() (#412)

Just another point I thought about: Even with `getEventListeners()` it is still possible for code interested in doing so to hide event handlers and prevent removing them from consumers by overriding `EventTarget.prototype.getEventListeners()` itself before any external code can get a reference.

```js
const origGetEventListeners = EventTarget.prototype.getEventListeners;
Object.defineProperty(EventTarget.prototype, 'getEventListeners', {
  value: function myGetEventListeners(eventType) {
    return origGetEventListeners.apply(this, arguments).filter(handler => myCustomFilterLogic(handler));
  }
});
```

So encapsulation is still possible just not the default with Lea's proposal.

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