code: function() {
  		var length = this.promises.length,
  			last = this.promises[length - 1];
  		if (length && last && !last.scraper) {
  			var ss = StaticScraper.create();
  			last.scraper = ss;
  			return ss;
  		} else {
  			throw new ScraperError('');
  		}
  	}
docs: Creates a static scraper, and associates it with the current
  router promise chain. Note that this method returns a
  {@see ScraperPromise} of a {@see StaticScraper}.
  
  @return {!ScraperPromise} A promise for the scraper.
  @public