GroupsIT: Remove never queried list

Change-Id: Iad397318d8d028e991864687ff01a4cc020a0585
diff --git a/javatests/com/google/gerrit/acceptance/api/group/GroupsIT.java b/javatests/com/google/gerrit/acceptance/api/group/GroupsIT.java
index 6f25d28..bc8d1f4 100644
--- a/javatests/com/google/gerrit/acceptance/api/group/GroupsIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/group/GroupsIT.java
@@ -89,7 +89,6 @@
 import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 import java.sql.Timestamp;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
@@ -334,9 +333,6 @@
     String p = createUniqueGroup();
     String g1 = createUniqueGroup();
     String g2 = createUniqueGroup();
-    List<String> groups = new ArrayList<>();
-    groups.add(g1);
-    groups.add(g2);
     gApi.groups().id(p).addGroups(g1, g2);
     assertIncludes(p, g1, g2);
   }