return this._findProxyForURL.call(this._sandBox, testURI, testHost); 
return callFunction(this._findProxyForURL, this._sandBox, testURI, testHost); 
    getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return this._findProxyForURL.call(this._sandBox, testURI, testHost);    }
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/dbf1be57b832a0c182b6d28befbf249948439e4f/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js