PART4: Removed the owner cache special handling from UserCrosSettingsProvider.

chrome/browser/chromeos/login/user_manager.cc

Index: chrome/browser/chromeos/login/user_manager.cc
diff --git a/chrome/browser/chromeos/login/user_manager.cc b/chrome/browser/chromeos/login/user_manager.cc
index 0881f31f8f487591eb0252ddb373777fc05e92eb..8544f197d2976824e4024916a16c64b71216ad5d 100644
--- a/chrome/browser/chromeos/login/user_manager.cc
+++ b/chrome/browser/chromeos/login/user_manager.cc
@@ -174,8 +174,9 @@ void UpdateOwnership(bool is_owner) {
       NotificationService::NoDetails());
   if (is_owner) {
     // Also update cached value.
-    UserCrosSettingsProvider::UpdateCachedOwner(
-      g_user_manager.Get().logged_in_user().email());
+    CrosSettings::Get()->SetString(
+        kDeviceOwner,
+        g_user_manager.Get().logged_in_user().email());
   }
 }