Run jshint over all JavaScript files

ports/devenv/devenv.js

 /*
  * Copyright 2015 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
+/* globals NaClProcessManager */
+
+'use strict';
+
 NaClProcessManager.fsroot = '/devenv';
 
 // TODO(sbc): This should be handled by nacl_io or perhaps by NaClProcessManager
 function makeRootDir() {
   return new Promise(function(accept, reject) {
     function createDir(rootDirEntry, dirname) {
       rootDirEntry.getDirectory(dirname, {create: true},
           function(dirEntry) {
             accept();
           },
           function() {
             console.log('rootDirEntry.getDirectory failed');
             reject();
           }
       );
     }
 
-    window.requestFileSystem  = window.requestFileSystem
-        || window.webkitRequestFileSystem;
+    window.requestFileSystem  = (window.requestFileSystem ||
+        window.webkitRequestFileSystem);
     window.requestFileSystem(
-        PERSISTENT,
+        window.PERSISTENT,
         0,
         function(fs) { createDir(fs.root, NaClProcessManager.fsroot); },
         function() {
           console.log('requestFileSystem failed!');
           reject();
         }
     );
   });
 }