Function serviceFactory

src/background/sync/base.js:220–227

(base)

}

function serviceFactory(base) {
  const Service = function constructor() {
    this.initialize();
  };
  Service.prototype = base;
  Service.extend = extendService;
  return Service;
}
function extendService(options) {
  return serviceFactory(Object.assign(Object.create(this.prototype), options));
}