[Spec] Untrusted network status needs to be recalculated every time a navigation ends.

See [CalculateUntrustedNetworkStatus](https://source.chromium.org/chromium/chromium/src/+/main:content/browser/renderer_host/navigation_request.cc;l=8048-8050;drc=05401be858fce13f572977457ff78cea16418569;bpv=1;bpt=1) call site in NavigationRequest::DidCommitNavigation.

The recalculation of untrusted network algorithm needs to be invoked every time a navigation ends (aborted or committed).