Added key-value storage for pending changes to OwnerSettingsServiceChromeOS.

components/ownership/owner_settings_service.h

Index: components/ownership/owner_settings_service.h
diff --git a/components/ownership/owner_settings_service.h b/components/ownership/owner_settings_service.h
index a1d7c52308a5a88cff32e69ad2539d23f8e3b535..8deabfa972bac7ffa1b51e38208b289c2e8b77a4 100644
--- a/components/ownership/owner_settings_service.h
+++ b/components/ownership/owner_settings_service.h
@@ -47,8 +47,8 @@ class OWNERSHIP_EXPORT OwnerSettingsService : public KeyedService {
     // TODO (ygorshenin@, crbug.com/230018): get rid of the method
     // since it creates DeviceSettingsService's dependency on
     // OwnerSettingsService.
-    virtual void OnTentativeChangesInPolicy(
-        const enterprise_management::PolicyData& policy_data) {}
+    virtual void OnTentativeChangeInSettings(const std::string& setting,
+                                             const base::Value& value) {}
   };
 
   typedef base::Callback<void(