Disabled ARC for ephemeral users.

chrome/browser/chromeos/arc/arc_auth_service.cc

Index: chrome/browser/chromeos/arc/arc_auth_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_auth_service.cc b/chrome/browser/chromeos/arc/arc_auth_service.cc
index 58f9a48b753f1bd729de483e9859e22e348e6e31..abf672ad9e24cac70f241e72df4f13726e99c154 100644
--- a/chrome/browser/chromeos/arc/arc_auth_service.cc
+++ b/chrome/browser/chromeos/arc/arc_auth_service.cc
@@ -230,6 +230,12 @@ void ArcAuthService::OnPrimaryUserProfilePrepared(Profile* profile) {
     return;
   }
 
+  if (user_manager::UserManager::Get()
+          ->IsCurrentUserCryptohomeDataEphemeral()) {
+    VLOG(2) << "Users with ephemeral data are not supported in Arc.";
+    return;
+  }
+
   profile_ = profile;
   PrefServiceSyncableFromProfile(profile_)->AddSyncedPrefObserver(
       prefs::kArcEnabled, this);