Refactor: remove unused method in IntentManager

Change-Id: Ifcec1a80674131379516f53ffdfb600651160f6d
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
index 69f6e45..23e5cbe 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentManager.java
@@ -1198,10 +1198,6 @@
 
             return completed;
         }
-
-        protected void writeBatch(BatchWrite batchWrite) {
-            store.batchWrite(batchWrite);
-        }
     }
 
     // TODO: better naming