GetCodeOwnersForPathInBranch: Make GitRepositoryManager final

This field is only assigned during initialization so we should make it
final.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ib90d91b771426df2c97be94da5aad6fa191fd76f
diff --git a/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnersForPathInBranch.java b/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnersForPathInBranch.java
index a474c00..af85973 100644
--- a/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnersForPathInBranch.java
+++ b/java/com/google/gerrit/plugins/codeowners/restapi/GetCodeOwnersForPathInBranch.java
@@ -53,7 +53,7 @@
  */
 public class GetCodeOwnersForPathInBranch extends AbstractGetCodeOwnersForPath
     implements RestReadView<CodeOwnersInBranchCollection.PathResource> {
-  private GitRepositoryManager repoManager;
+  private final GitRepositoryManager repoManager;
   private String revision;
 
   @Option(name = "-revision", usage = "revision from which the code owner configs should be read")