Make DeleteChangeOp.Factory public

Like other factory interfaces in the restapi package, Google needs to
bind this manually.

Change-Id: I6a08a4d1eb5df383186233551dfd8f853ccbbd82
diff --git a/java/com/google/gerrit/server/restapi/change/DeleteChangeOp.java b/java/com/google/gerrit/server/restapi/change/DeleteChangeOp.java
index 05de507..80bdd1a 100644
--- a/java/com/google/gerrit/server/restapi/change/DeleteChangeOp.java
+++ b/java/com/google/gerrit/server/restapi/change/DeleteChangeOp.java
@@ -38,8 +38,8 @@
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.revwalk.RevWalk;
 
-class DeleteChangeOp implements BatchUpdateOp {
-  interface Factory {
+public class DeleteChangeOp implements BatchUpdateOp {
+  public interface Factory {
     DeleteChangeOp create(Change.Id id);
   }