Update ProfileNetworkContextService for ephemeral guest profiles.

ProfileNetworkContextService is updated to use Guest policy for
ephemeral Guest profiles.

This change is behind disabled EnableEphemeralGuestProfilesOnDesktop
flag. Please see go/guest-on-disk for more context.

Bug: 1125474
Change-Id: Ic58cbbb3d90ce2edca8d43da2cadab4ef28f5aed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450189Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813776}

chrome/browser/net/profile_network_context_service.cc

@@ -136,13 +136,13 @@ network::mojom::AdditionalCertificatesPtr GetAdditionalCertificates(
 // feature flag and policy. Next steps would be changing the feature value to
 // false after enough heads up and then removing the feature.
 bool IsAmbientAuthAllowedForProfile(Profile* profile) {
-  if (profile->IsRegularProfile())
+  if (profile->IsRegularProfile() && !profile->IsEphemeralGuestProfile())
     return true;
 
   // Non-primary OTR profiles are not used to create browser windows and are
   // only technical means for a task that does not need to leave state after
   // it's completed.
-  if (!profile->IsPrimaryOTRProfile())
+  if (profile->IsOffTheRecord() && !profile->IsPrimaryOTRProfile())
     return true;
 
   PrefService* local_state = g_browser_process->local_state();
@@ -154,7 +154,7 @@ bool IsAmbientAuthAllowedForProfile(Profile* profile) {
       static_cast<net::AmbientAuthAllowedProfileTypes>(local_state->GetInteger(
           prefs::kAmbientAuthenticationInPrivateModesEnabled));
 
-  if (profile->IsGuestSession()) {
+  if (profile->IsGuestSession() || profile->IsEphemeralGuestProfile()) {
     return base::FeatureList::IsEnabled(
                features::kEnableAmbientAuthenticationInGuestSession) ||
            type == net::AmbientAuthAllowedProfileTypes::GUEST_AND_REGULAR ||