Bug 1030430 - updated call log accessibility to work as a listbox.

This is really gross. I'd rather write this instead:
```js
var logItems = cont.querySelectorAll('.log-item');
for (var i = 0; i < logItems.length; i++) {
  logItems[i].setAttribute('aria-selected', false);
}
```
This looks a lot more clear to me, even if it's a bit slower.