Allows endpoint owner to delete subscription.
        Confirmation message will be delivered.

        :type subscription: string
        :param subscription: The ARN of the subscription to be deleted.

def unsubscribe(self, subscription):
        """
        Allows endpoint owner to delete subscription.
        Confirmation message will be delivered.

        :type subscription: string
        :param subscription: The ARN of the subscription to be deleted.

        """
        params = {'ContentType' : 'JSON',
                  'SubscriptionArn' : subscription}
        response = self.make_request('Unsubscribe', params, '/', 'GET')
        body = response.read()
        if response.status == 200:
            return json.loads(body)
        else:
            boto.log.error('%s %s' % (response.status, response.reason))
            boto.log.error('%s' % body)
            raise self.ResponseError(response.status, response.reason, body)