AccountDirectory: Remove unnecessary serialVersionUID

Change-Id: I329d3e751317b77d6372899e731b8339e7fe99a4
diff --git a/java/com/google/gerrit/server/account/AccountDirectory.java b/java/com/google/gerrit/server/account/AccountDirectory.java
index 1ad457a..ee9265f 100644
--- a/java/com/google/gerrit/server/account/AccountDirectory.java
+++ b/java/com/google/gerrit/server/account/AccountDirectory.java
@@ -50,6 +50,4 @@
 
   public abstract void fillAccountInfo(Iterable<? extends AccountInfo> in, Set<FillOptions> options)
       throws PermissionBackendException;
-
-  private static final long serialVersionUID = 1L;
 }