ActionITBase: remove redundant specification of type argument

Change-Id: Iebb5d66bf706741be7b1db0a7e3ebb0e9802ee14
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
index 20c1fea..e638653 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
@@ -163,7 +163,7 @@
   }
 
   public ResponseHandler<Object> assertHttpResponseCode(int responseCode) {
-    return new ResponseHandler<Object>() {
+    return new ResponseHandler<>() {
 
       @Override
       public Object handleResponse(HttpResponse response)