This is very confusing as seen in #12974 or #12906. My suggestion would be "legacy."
return webpackStream(webpackConfig, webpack2);
}
function getVersionJSON() {
  return JSON.parse(fs.readFileSync(BUILD_DIR + "version.json").toString());
}
function checkChromePreferencesFile(chromePrefsPath, webPrefsPath) {
  var chromePrefs = JSON.parse(fs.readFileSync(chromePrefsPath).toString());
  var chromePrefsKeys = Object.keys(chromePrefs.properties);
  chromePrefsKeys = chromePrefsKeys.filter(function (key) {
    var description = chromePrefs.properties[key].description;
    
    
    
    return !description || !description.startsWith("DEPRECATED.");
  });
  chromePrefsKeys.sort();
  var webPrefs = JSON.parse(fs.readFileSync(webPrefsPath).toString());
  var webPrefsKeys = Object.keys(webPrefs);