Adapt to enabling error level for the AutoValueImmutableFields bug pattern

AutoValue instances should be deeply immutable.

Fix the current issues so that the build continues to work.

Bug: Issue 15056
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I082afcddae982705f9fb64f4f86cd460f3fdd2f7

src/test/java/com/googlesource/gerrit/plugins/replication/TestUriUpdates.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/TestUriUpdates.java b/src/test/java/com/googlesource/gerrit/plugins/replication/TestUriUpdates.java
index f61114e..080f279 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/TestUriUpdates.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/TestUriUpdates.java
@@ -15,6 +15,7 @@
 package com.googlesource.gerrit.plugins.replication;
 
 import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.entities.Project;
 import com.googlesource.gerrit.plugins.replication.ReplicationTasksStorage.ReplicateRefUpdate;
 import java.net.URISyntaxException;
@@ -34,7 +35,7 @@
 
   public static TestUriUpdates create(
       Project.NameKey project, URIish uri, String remote, Set<String> refs) {
-    return new AutoValue_TestUriUpdates(project, uri, remote, refs);
+    return new AutoValue_TestUriUpdates(project, uri, remote, ImmutableSet.copyOf(refs));
   }
 
   @Override
@@ -47,5 +48,5 @@
   public abstract String getRemoteName();
 
   @Override
-  public abstract Set<String> getRefs();
+  public abstract ImmutableSet<String> getRefs();
 }