Google API Callback + 1 Button does not work after updating Google

Question

My "onPlus" callback on the Google + 1 button from an external website no longer works after the last Google update to delete the counter on the Google + 1 button.

See https://plus.google.com/110610523830483756510/posts/Z1FfzduveUo

My code

<script src="https://apis.google.com/js/platform.js" async defer></script>
<div class="g-plusone" data-href="http://sample.com/" data-autoclose="true" data-recommendations="false" data-callback="onPlus"></div>

Is there a way to return a callback function?