openlayers/ol3 — pull request #791 by fredj (2013-06-14 08:13:00+00:00)
Title: ol.MapBrowserEvent: call browserEvent.{preventDefault|stopPropagation}

This allows to have the following event handler:
```javascript
map.on('contextmenu', function(event) {
event.preventDefault();
});
```

But this is a workaround; the cleanest solution would be that `ol.MapBrowserEvent` directly inherits from `goog.events.BrowserEvent`