GPT Resize Freewheel Frame

gistfile1.html

<!--nosandbox-->
<div id='div-gpt-ad-1234567891234-728x90'></div><!-- change this elements id so it's unique -->
<script type="text/javascript">
    var googletag = googletag || {};
    googletag.cmd = googletag.cmd || [];
    (function() {
        var gads = document.createElement("script");
        gads.async = true;
        gads.type = "text/javascript";
        var useSSL = "https:" == document.location.protocol;
        gads.src = (useSSL ? "https:" : "http:") + "//www.googletagservices.com/tag/js/gpt.js";
        var node = document.getElementsByTagName("script")[0];
        node.parentNode.insertBefore(gads, node);
    })();

    (function() {

        var conf = {
            baseName: '',                           //network id and ad unit here e.g /1234/site.com
            formats: [728,90],                      //sizes here, can support multiples eg. [[728,90],[970,250]]
            div: 'div-gpt-ad-1234567891234-728x90', //change this to match the div id above
            pageMatch: {                            //URL regex patterns for setting second level ad units
                'homepage': '^\/$'                  //detects homapge and sets a second level ad unit e.g /1234/site.com/homapge
            },
        };

        function resizeSlot(width, height) {
            if (window.self === window.top) {
                return;
            }
            var slot, fid = window.frameElement.getAttribute('id');
            slot = window.top.document.getElementById(fid);
            slot.setAttribute('width', width);
            slot.setAttribute('height', height);
            return;
        }

        function path() {
            if (window.self === window.top) {
                return window.location.pathname;
            } else {
                var a = document.createElement('a');
                a.href = document.referrer;
                return (typeof a.hostname !== 'undefined') ? a.pathname : '';
            }
        }

        function pageMatcher() {
            if (typeof conf.pageMatch !== 'undefined' &&
                Object.prototype.toString.call(conf.pageMatch) === '[object Object]') {
                for (var section in conf.pageMatch) {
                    try {
                        if (path().match(conf.pageMatch[section])) {
                            return conf.baseName + '/' + section;
                        }
                    } catch (err) {}
                }
            }
            return conf.baseName;
        }
        googletag.cmd.push(function() {
            googletag.pubads().addEventListener('slotRenderEnded', function(event) {
                console.log('Creative with id: ' + event.creativeId +
                    ' is rendered to slot of size: ' + event.size[0] + 'x' + event.size[1]);
                resizeSlot(event.size[0], event.size[1]);
            });
            googletag.pubads().display(pageMatcher(), conf.formats, conf.div);
        });

    })();
</script>