[USS] Show USS counters in about:sync page

components/sync/driver/glue/sync_backend_host_core.h

Index: components/sync/driver/glue/sync_backend_host_core.h
diff --git a/components/sync/driver/glue/sync_backend_host_core.h b/components/sync/driver/glue/sync_backend_host_core.h
index ac70b2ed45c98717270e1484a1ea69899765b291..c2be0db85796fd49206f19a7de0adf34d7fafbe2 100644
--- a/components/sync/driver/glue/sync_backend_host_core.h
+++ b/components/sync/driver/glue/sync_backend_host_core.h
@@ -140,8 +140,9 @@ class SyncBackendHostCore
                                const syncer::CommitCounters& counters) override;
   void OnUpdateCountersUpdated(syncer::ModelType type,
                                const syncer::UpdateCounters& counters) override;
-  void OnStatusCountersUpdated(syncer::ModelType type,
-                               const syncer::StatusCounters& counters) override;
+  void OnStatusCountersUpdated(
+      syncer::ModelType type,
+      std::unique_ptr<syncer::StatusCounters> counters) override;
 
   // Forwards an invalidation state change to the sync manager.
   void DoOnInvalidatorStateChange(syncer::InvalidatorState state);