Adapt to API changes in 3.3

Change-Id: Ie9abc74341f6d5b760abce0fe4ea339ae6ca5175

src/main/java/com/googlesource/gerrit/plugins/rejectprivate/RejectPrivateSubmitListener.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/rejectprivate/RejectPrivateSubmitListener.java b/src/main/java/com/googlesource/gerrit/plugins/rejectprivate/RejectPrivateSubmitListener.java
index d8a0fcc..702fcfd 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/rejectprivate/RejectPrivateSubmitListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/rejectprivate/RejectPrivateSubmitListener.java
@@ -19,6 +19,7 @@
 import com.google.gerrit.extensions.registration.DynamicSet;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.git.CodeReviewCommit;
+import com.google.gerrit.server.git.CodeReviewCommit.CodeReviewRevWalk;
 import com.google.gerrit.server.git.validators.MergeValidationException;
 import com.google.gerrit.server.git.validators.MergeValidationListener;
 import com.google.gerrit.server.project.ProjectState;
@@ -44,6 +45,7 @@
   @Override
   public void onPreMerge(
       Repository repo,
+      CodeReviewRevWalk revWalk,
       CodeReviewCommit commit,
       ProjectState destProject,
       BranchNameKey destBranch,