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

Sorry if this has been mentioned already, but re:security and encapsulation concerns: but developers can already intercept `addEventListener` by doing something like

```js
let addEventListener = EventTarget.prototype.addEventListener;
let removeEventListener = EventTarget.prototype.removeEventListener;

EventTarget.prototype.addEventListener = function(type, callback, options) {
 /* store args and then… */
 addEventListener.call(this, type, callback, options);
};

EventTarget.prototype.removeEventListener = function(type, callback, options) {
 /* remove from stored args and then… */
 removeEventListener.call(this, type, callback, options);
};
```

The problem is just that a) it's flimsy, since listeners may have been attached before the code was run and b) it's suboptimal to be overwriting built-ins like that.

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