Revert "Commit updated Javascript packages"

This reverts commit a88734348a.

build/javascript/node_modules/postcss-js/async.js

@@ -1,14 +0,0 @@
-var postcss = require('postcss')
-
-var processResult = require('./process-result')
-var parse = require('./parser')
-
-module.exports = function (plugins) {
-  var processor = postcss(plugins)
-  return function (input) {
-    return processor.process(input, {
-      parser: parse,
-      from: undefined
-    }).then(processResult)
-  }
-}