Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

build/javascript/node_modules/readable-stream/experimentalWarning.js

@@ -1,17 +0,0 @@
-'use strict'
-
-var experimentalWarnings = new Set();
-
-function emitExperimentalWarning(feature) {
-  if (experimentalWarnings.has(feature)) return;
-  var msg = feature + ' is an experimental feature. This feature could ' +
-       'change at any time';
-  experimentalWarnings.add(feature);
-  process.emitWarning(msg, 'ExperimentalWarning');
-}
-
-function noop() {}
-
-module.exports.emitExperimentalWarning = process.emitWarning
-  ? emitExperimentalWarning
-  : noop;