Rendered font in Chrome developer tools

While migrating from Ionic 1 to Ionic 2 I’ve noticed that the text fonts have changed when running in browser with ionic serve.

Although the css says “-apple-system, ‘Helvetica Neue’, Roboto, sans-serif;” - the actual rendered font is Arial.
In Ionic 1 it was “Segoe UI”.

I could not find any references to these actual fonts in both applications.
Any idea where they are coming from?