That couldn't be done in Odoo without an js extension, specifically you need to extend the js class "instance.web.ActionManager" to add a new action type with the same code of the ir_actions_report_xml. The following code need to be loaded in a js file and does the job by creating the action ir_actions_report_xml_no_close with the close dialog lines removed:

instance.web.ActionManager.include({
  ir_actions_report_xml_no_close: function(action, options) {
    var self = this;
    instance.web.blockUI();
    action = _.clone(action);
    var eval_contexts = ([instance.session.user_context] || []).concat([action.context]);
    action.context = instance.web.pyeval.eval('contexts',eval_contexts);
    // iOS devices doesn't allow iframe use the way we do it,
    // opening a new window seems the best way to workaround
    if (navigator.userAgent.match(/(iPod|iPhone|iPad)/)) {
      var params = {
        action: JSON.stringify(action),
        token: new Date().getTime()
      };
      var url = self.session.url('/web/report', params);
      instance.web.unblockUI();
      $('<a href="'+url+'" target="_blank"></a>')[0].click();
      return;
    }
    var c = instance.webclient.crashmanager;
    return $.Deferred(function (d) {
      self.session.get_file({
        url: '/web/report',
        data: {action: JSON.stringify(action)},
        complete: instance.web.unblockUI,
        success: function(){
          d.resolve();
        },
        error: function () {
          c.rpc_error.apply(c, arguments);
          d.reject();
        }
      });
    });
  }
});

To use the new action you just need to change a little your return action in your method to return:

return {
  'type': 'ir.actions.report.xml_no_close',
  'report_name': 'trescloud_ats_2013_report',
  'datas': {
    'model': 'sri.ats.2013',
    'res_ids': ids
  }
}

Hope this helps