Remove unused variables

Change-Id: I45b3dda02417082ae73a4a45b1fea53fa0c338c3

src/main/java/com/googlesource/gerrit/plugins/batch/BatchSubmitter.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/batch/BatchSubmitter.java b/src/main/java/com/googlesource/gerrit/plugins/batch/BatchSubmitter.java
index abaad8b..018f524 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/batch/BatchSubmitter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/batch/BatchSubmitter.java
@@ -45,9 +45,7 @@
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectInserter;
 import org.eclipse.jgit.lib.ObjectReader;
-import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
-import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
 
 public class BatchSubmitter {
@@ -170,8 +168,6 @@
         ObjectInserter ins = repo.newObjectInserter();
         ObjectReader reader = ins.newReader();
         RevWalk walk = new RevWalk(reader)) {
-      Ref destRef = repo.getRefDatabase().exactRef(destination.get());
-      RevCommit newTip = walk.parseCommit(destRef.getObjectId());
       bu.setRepository(repo, walk, ins);
       bu.setRefLogMessage("merged (batch submit)");
       bu.addOp(