Make ReplicationQueue#recursivelyDelete private

It's only used within ReplicationQueue, so doesn't need to be public.

Change-Id: I424cf4f9e7dba8d9a117be5bfd523bd5e928db31
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationQueue.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationQueue.java
index 40b2bee..606bfe2 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationQueue.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationQueue.java
@@ -322,7 +322,7 @@
     }
   }
 
-  public static void recursivelyDelete(File dir) throws IOException {
+  private static void recursivelyDelete(File dir) throws IOException {
     File[] contents = dir.listFiles();
     if (contents != null) {
       for (File d : contents) {