Fix double EnableNamespaces

PiperOrigin-RevId: 258142629
Change-Id: Ied76490e51278371fd51e117053599cce52991f1
diff --git a/sandboxed_api/sandbox2/namespace_test.cc b/sandboxed_api/sandbox2/namespace_test.cc
index 06c28cf..d4d190e 100644
--- a/sandboxed_api/sandbox2/namespace_test.cc
+++ b/sandboxed_api/sandbox2/namespace_test.cc
@@ -107,7 +107,6 @@
                                           .EnableNamespaces()
                                           // Don't restrict the syscalls at all
                                           .DangerDefaultAllowAll()
-                                          .EnableNamespaces()
                                           .TryBuild());
 
     Sandbox2 sandbox(std::move(executor), std::move(policy));