Samsung L870 Uses 'Safari'
The default web browser of the S60 platform is indeed a WebKit-based browser developed by Nokia. The "Safari" designation, however, would seem to indicate some cooperation with Apple, as Safari is an Apple-registered trademark.
Regardless, the move appears to be yet another win for the Apple-supported WebKit rendering engine. Recently, Adobe has announced that the Air platform is utilizing WebKit, and Dreamweaver CS4 will be using WebKit for its Live View feature.