RateLimitUploadPackIT: Remove unnecessary method parameter list

Change-Id: Ieeefb1ed3401d28e862611a05c3dc15ca3941761
diff --git a/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java b/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
index 4a22649..f421748 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
@@ -35,7 +35,7 @@
   public void setUp() throws Exception {
     // Create the group before the plugin is loaded since limits per group are
     // resolved at plugin load time.
-    addUserToNewGroup(user.username, "limitGroup");
+    addUserToNewGroup();
     super.setUp();
   }
 
@@ -60,12 +60,13 @@
     cloneProject(new Project.NameKey(projectB), user);
   }
 
-  private void addUserToNewGroup(String user, String groupName) throws RestApiException {
+  private void addUserToNewGroup() throws RestApiException {
     GroupInput in = new GroupInput();
+    String groupName = "limitGroup";
     in.name = groupName;
     in.ownerId = "Administrators";
     gApi.groups().create(in);
-    gApi.groups().id(groupName).addMembers(user);
+    gApi.groups().id(groupName).addMembers(user.username);
   }
 
   private void createProjectWithChange(String projectName) throws RestApiException {