Fix issue with incorrect import for Nullable annotation

Change-Id: I79617913ea1e110ced3e266ca890711b82c1e698

src/main/java/com/ericsson/gerrit/plugins/highavailability/forwarder/ForwardedAwareEventBroker.java

diff --git a/src/main/java/com/ericsson/gerrit/plugins/highavailability/forwarder/ForwardedAwareEventBroker.java b/src/main/java/com/ericsson/gerrit/plugins/highavailability/forwarder/ForwardedAwareEventBroker.java
index 83482fe..ce2caaf 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/highavailability/forwarder/ForwardedAwareEventBroker.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/highavailability/forwarder/ForwardedAwareEventBroker.java
@@ -14,6 +14,7 @@
 
 package com.ericsson.gerrit.plugins.highavailability.forwarder;
 
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.server.config.GerritInstanceId;
 import com.google.gerrit.server.events.Event;
 import com.google.gerrit.server.events.EventBroker;
@@ -25,7 +26,6 @@
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.inject.Inject;
 import java.util.Objects;
-import javax.annotation.Nullable;
 
 class ForwardedAwareEventBroker extends EventBroker {