Update bootstrap requires

script/bootstrap

@@ -3,7 +3,6 @@
 var fs = require('fs');
 var verifyRequirements = require('./utils/verify-requirements');
 var safeExec = require('./utils/child-process-wrapper.js').safeExec;
-var fs = require('fs');
 var path = require('path');
 
 // Executes an array of commands one by one.

script/utils/verify-requirements.js

@@ -1,3 +1,6 @@
+var path = require('path');
+var fs = require('fs');
+
 module.exports = function() {
   verifyNode();
   verifyPython27();