Remove the original-fs.js

It is acutally not needed.

atom/common/api/lib/original-fs.coffee

@@ -1,8 +0,0 @@
-vm = require 'vm'
-
-# Execute the 'fs.js' and pass the 'exports' to it.
-source = '(function (exports, require, module, __filename, __dirname) { ' +
-         process.binding('natives').originalFs +
-         '\n});'
-fn = vm.runInThisContext source, { filename: 'fs.js' }
-fn exports, require, module