MultiSiteRepository: Remove unused MultiSiteRefDatabase.Factory member

Change-Id: Idb6b76b84eef6e43d92d206e32df6a9b4e537b85
diff --git a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRepository.java b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRepository.java
index b3678c6..29c42e7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRepository.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRepository.java
@@ -53,7 +53,6 @@
 
 public class MultiSiteRepository extends Repository {
 
-  private final MultiSiteRefDatabase.Factory multiSiteRefDbFactory;
   private final Repository repository;
   private final RefDatabase refDatabase;
   private final MultiSiteRefDatabase multiSiteRefDatabase;
@@ -68,7 +67,6 @@
       @Assisted String projectName,
       @Assisted Repository repository) {
     super(new BaseRepositoryBuilder());
-    this.multiSiteRefDbFactory = multiSiteRefDbFactory;
     this.repository = repository;
     this.refDatabase = repository.getRefDatabase();
     this.multiSiteRefDatabase = multiSiteRefDbFactory.create(projectName, refDatabase);