return callFunction(this._findProxyForURL, this._sandBox, testURI, testHost); 
return callFunction.call(this._sandBox, this._findProxyForURL, testURI, testHost); 
    getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return callFunction(this._findProxyForURL, this._sandBox,                            testURI, testHost);    }
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/5ab9bad4265d5e1aeb904d051532c1c22283bb94/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js