This got me most of the way there. I'm running Splunk v6.4.2 and from what I have read Google Maps is not officially supported under v6. I attempted the above fix but the maps would not load but instead hung on "Initializing maps". After looking through some browser console output I saw that the initMap function was not found. I then changed the s.src string to this:
s.src = "https://maps.googleapis.com/maps/api/js?key=API_KEY&callback=_gmapsOnLoad";
Maps now load and I'm able to map the source IPs of my firewall drops onto a map. Very cool!
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