MessagePublisher: Remove unused LifecycleListener interface

Change-Id: Iecc428494860d91d4a5e8df6458e00baaacd475b
diff --git a/src/main/java/com/googlesource/gerrit/plugins/kafka/message/MessagePublisher.java b/src/main/java/com/googlesource/gerrit/plugins/kafka/message/MessagePublisher.java
index 9f235a1..f77a942 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/kafka/message/MessagePublisher.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/kafka/message/MessagePublisher.java
@@ -14,7 +14,6 @@
 
 package com.googlesource.gerrit.plugins.kafka.message;
 
-import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.server.events.Event;
 import com.google.gson.Gson;
 import com.google.inject.Inject;
@@ -24,7 +23,7 @@
 import com.googlesource.gerrit.plugins.kafka.session.Session;
 import com.googlesource.gerrit.plugins.kafka.session.SessionFactoryProvider;
 
-public class MessagePublisher implements Publisher, LifecycleListener {
+public class MessagePublisher implements Publisher {
 
   private final Session session;
   private final KafkaProperties properties;