How do I register this so I can use nsIContentPolicy shouldLoad method?

chromeless\modules\lib\chromeless-policy.js

const {Cc, Ci, Cu, Cm, Cr} = require("chrome");

const xpcom = require("xpcom");

/***********************************************************
class definition
***********************************************************/

var description = "Chromeless Policy XPCOM Component";
/* UID generated by http://www.famkruithof.net/uuid/uuidgen */
var classID = Components.ID("{2e946f14-72d5-42f3-95b7-4907c676cf2b}");
// I just made this up. Don't know if I'm supposed to do that.
var contractID = "@mozilla.org/chromeless-policy;1";

//class constructor
function ChromelessPolicy() {
    //this.wrappedJSObject = this;
}

// class definition
var ChromelessPolicy = {

  // properties required for XPCOM registration:
  classDescription: description,
  classID:          classID,
  contractID:       contractID,
  xpcom_categories: ["content-policy"],

  // QueryInterface implementation
  QueryInterface: xpcom.utils.generateQI([Ci.nsIContentPolicy,
	Ci.nsIFactory, Ci.nsISupportsWeakReference]),

  // ...component implementation...
  shouldLoad : function(aContentType, aContentLocation, aRequestOrigin, aContext, aMimeTypeGuess, aExtra) {
	let result = Ci.nsIContentPolicy.ACCEPT;
	// only filter DOCUMENTs (not SUB_DOCUMENTs, like iframes)
    if( aContentType === Ci.nsIContentPolicy["TYPE_DOCUMENT"]
        // block http(s) protocols...
        && /^http(s):/.test(aContentLocation.spec) ){
		// make sure we deny the request now
		result = Ci.nsIContentPolicy.REJECT_REQUEST;
	}
    // continue loading...
    return result;
  },
  createInstance: function(outer, iid) {
    if (outer)
        throw Cr.NS_ERROR_NO_AGGREGATION;
    return this.QueryInterface(iid);
  }
};

let registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
try
{
	Cm.nsIComponentRegistrar.registerFactory(classID, description, contractID, ChromelessPolicy);
}
catch (e) {
	// Don't stop on errors - the factory might already be registered
	Cu.reportError(e);
}

const categoryManager = Cc["@mozilla.org/categorymanager;1"].getService(Ci.nsICategoryManager);
for each (let category in ChromelessPolicy.xpcom_categories) {
	categoryManager.addCategoryEntry(category, ChromelessPolicy.classDescription, ChromelessPolicy.contractID, false, true);
}