code: function writeParamsForRequestHeaders(entry, out, consumedParams) {
      const params = entry.params;
  
      if (!(typeof params.line === 'string') ||
          !(params.headers instanceof Array)) {
        // Unrecognized params.
        return;
      }
  
      // Strip the trailing CRLF that params.line contains.
      const lineWithoutCRLF = params.line.replace(/\r\n$/g, '');
      out.writeArrowIndentedLines([lineWithoutCRLF].concat(params.headers));
  
      consumedParams.line = true;
      consumedParams.headers = true;
    }
docs: Outputs the request header parameters of |entry| to |out|.