KHTML / Konqueror is the foundation of Blink / V8 / Chromium. It wasn't build in one day by Google. They forked an existing project, utilizing (L)GPL. Gnome never had their own browser engine which was build from the ground up. Mozilla Firefox (or Phoenix/Firebird) was Gtk+ back in the days, Konqueror Qt. Later on Gnome got a native browser but it was some silly fork anyway. Chrome benefits from the network effect, integration with other popular Google products such as Google search, Gmail, YouTube.