fonts.googleapis.com returns 403 in Chrome's guest window

I added the following fonts to my blog:

```
https://fonts.googleapis.com/css?family=Roboto:300,300italic,400,400italic,700,700italic|Lato:300,300italic,400,400italic,700,700italic|Merriweather:300,300italic,400,400italic,700,700italic|Parisienne:300,300italic,400,400italic,700,700italic|Consolas:300,300italic,400,400italic,700,700italic&subset=latin,latin-ext
```
the request always returns 403.
After clicking the link in Chrome, it works. But on a new device, it does not work.

I managed to reproduce the problem by using guest window.