chromeos: Avoid bogus child account warning at startup.

chrome/browser/supervised_user/child_accounts/child_account_service.cc

Index: chrome/browser/supervised_user/child_accounts/child_account_service.cc
diff --git a/chrome/browser/supervised_user/child_accounts/child_account_service.cc b/chrome/browser/supervised_user/child_accounts/child_account_service.cc
index 5081a2d60d4669e1f3d6d689c3f357b6b1a024e5..a624431c636a7aeb796c3dcd77843394bc5d8c91 100644
--- a/chrome/browser/supervised_user/child_accounts/child_account_service.cc
+++ b/chrome/browser/supervised_user/child_accounts/child_account_service.cc
@@ -296,12 +296,10 @@ void ChildAccountService::PropagateChildStatusToUser(bool is_child) {
 #if defined(OS_CHROMEOS)
   user_manager::User* user =
       chromeos::ProfileHelper::Get()->GetUserByProfile(profile_);
-  if (user) {
+  if (user)
     user_manager::UserManager::Get()->ChangeUserChildStatus(user, is_child);
-  } else {
-    LOG(WARNING) <<
-        "User instance wasn't found while setting child account flag.";
-  }
+  else if (!chromeos::ProfileHelper::Get()->IsSigninProfile(profile_))
+    LOG(DFATAL) << "User instance not found while setting child account flag.";
 #endif
 }