Uncaught SecurityError occurs

```
Uncaught SecurityError: Access to 'localStorage' is denied for this document. 
```

Environment:
* flight 1.1.3
* Chromium 32.0.1700.107 (248368) with 'Block third-party cookies and site-data' setting
* Arch Linux
* flight within an iframe with different domains

see example below:

```
<!-- http://localhost:8000/a.html -->
<html>
<head></head>
<body>
  <iframe src="http://127.0.0.1:8000/b.html"></iframe>
</body>
</html>
```

```
<!-- http://127.0.0.1:8000/b.html -->
<html>
<head>
  <script src="http://flightjs.github.io/release/latest/flight.js"></script>
</head>
<body>
</body>
</html>
```

Then open the URL `http://localhost:8000/a.html` in Browser and error occurs.