rem: return this._findProxyForURL.call(this._sandBox, testURI, testHost); 
add: return callFunction(this, "_findProxyForURL", this._sandBox, testURI, testHost); 
context:     getProxyForURI: function(testURI, testHost) {        if (!this._findProxyForURL)            return null;        // Call the original function        return this._findProxyForURL.call(this._sandBox, testURI, testHost);    }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/d22f75038d5bdf16deeda0b4343788c9a0586c48/nsProxyAutoConfig.js/clean/netwerk/base/src/nsProxyAutoConfig.js