Bug 1130775 followup: Add 'override' keyword to macro-provided AddRef/Release methods for QuotaClient::GetDirectoryLockListener. rs=ehsan

dom/indexedDB/ActorsParent.cpp

@@ -8338,7 +8338,7 @@ public:
     MOZ_ASSERT(QuotaClient::GetInstance() == aQuotaClient);
   }
 
-  NS_INLINE_DECL_REFCOUNTING(QuotaClient::GetDirectoryLockListener)
+  NS_INLINE_DECL_REFCOUNTING(QuotaClient::GetDirectoryLockListener, override)
 
 private:
   ~GetDirectoryLockListener()