Lock only permitted where a supervised user is or was.

chrome/browser/profiles/profile_info_cache.cc

Index: chrome/browser/profiles/profile_info_cache.cc
diff --git a/chrome/browser/profiles/profile_info_cache.cc b/chrome/browser/profiles/profile_info_cache.cc
index c2e414899c4036c0cd094f7e5b924abc8dda16ab..1c50724c58e87802df0d7b9fe90dd0ef43f91f6b 100644
--- a/chrome/browser/profiles/profile_info_cache.cc
+++ b/chrome/browser/profiles/profile_info_cache.cc
@@ -166,6 +166,12 @@ ProfileInfoCache::ProfileInfoCache(PrefService* prefs,
     if (!info->HasKey(kIsUsingDefaultAvatarKey)) {
       info->SetBoolean(kIsUsingDefaultAvatarKey, using_default_name);
     }
+
+    std::string supervised_user_id;
+    if (info->GetString(kSupervisedUserId, &supervised_user_id) &&
+        !supervised_user_id.empty()) {
+      prefs_->SetBoolean(prefs::kSupervisedUserExistsOrExisted, true);
+    }
   }
 
   // If needed, start downloading the high-res avatars and migrate any legacy
@@ -200,6 +206,8 @@ void ProfileInfoCache::AddProfileToCache(
   // Default value for whether background apps are running is false.
   info->SetBoolean(kBackgroundAppsKey, false);
   info->SetString(kSupervisedUserId, supervised_user_id);
+  if (!supervised_user_id.empty())
+    prefs_->SetBoolean(prefs::kSupervisedUserExistsOrExisted, true);
   info->SetBoolean(kIsOmittedFromProfileListKey, !supervised_user_id.empty());
   info->SetBoolean(kProfileIsEphemeral, false);
   info->SetBoolean(kIsUsingDefaultNameKey, IsDefaultProfileName(name));
@@ -550,6 +558,9 @@ void ProfileInfoCache::SetSupervisedUserIdOfProfileAtIndex(
   // This takes ownership of |info|.
   SetInfoForProfileAtIndex(index, info.release());
 
+  if (!id.empty())
+    prefs_->SetBoolean(prefs::kSupervisedUserExistsOrExisted, true);
+
   base::FilePath profile_path = GetPathOfProfileAtIndex(index);
   FOR_EACH_OBSERVER(ProfileInfoCacheObserver,
                     observer_list_,