Remove redundant modifiers from interface methods

Change-Id: I7c046f3bdf12da3c54d1cea09d88c21b8dd91140
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationStateListener.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationStateListener.java
index e5ac9d5..4dcf5a1 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationStateListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationStateListener.java
@@ -28,7 +28,7 @@
    * @param msg message description of the error
    * @param states replication states impacted
    */
-  public abstract void warn(String msg, ReplicationState... states);
+  void warn(String msg, ReplicationState... states);
 
   /**
    * Notify a fatal replication error.
@@ -39,7 +39,7 @@
    * @param msg message description of the error
    * @param states replication states impacted
    */
-  public abstract void error(String msg, ReplicationState... states);
+  void error(String msg, ReplicationState... states);
 
   /**
    * Notify a fatal replication error with the associated exception.
@@ -50,7 +50,7 @@
    * @param t exception that caused the replication to fail
    * @param states replication states impacted
    */
-  public abstract void error(String msg, Throwable t,
+  void error(String msg, Throwable t,
       ReplicationState... states);
 
 }