You would need to make a JSONP request for cross domain access. Could you please set the following properties and check if this works out for you.
You can get the detailed description of JSONP over here...
eventSources: [
{
url: "http://www.google.com/calendar/feeds/feed_one",
dataType : 'jsonp',
className: 'feed_one'
},
{
url: "http://www.google.com/calendar/feeds/feed_two",
dataType : 'jsonp',
className: 'feed_two',
]