GN: Build nacl_helper_nonsfi unit tests

sandbox/linux/BUILD.gn

Index: sandbox/linux/BUILD.gn
diff --git a/sandbox/linux/BUILD.gn b/sandbox/linux/BUILD.gn
index 516342513bccb9387c5235f02a728a8e48dd3e41..8396a661add07b27cbaaf324162db3bce4ae5651 100644
--- a/sandbox/linux/BUILD.gn
+++ b/sandbox/linux/BUILD.gn
@@ -55,8 +55,6 @@ source_set("sandbox_linux_test_utils") {
     "tests/sandbox_test_runner.h",
     "tests/sandbox_test_runner_function_pointer.cc",
     "tests/sandbox_test_runner_function_pointer.h",
-    "tests/test_utils.cc",
-    "tests/test_utils.h",
     "tests/unit_tests.cc",
     "tests/unit_tests.h",
   ]
@@ -65,7 +63,14 @@ source_set("sandbox_linux_test_utils") {
     "//testing/gtest",
   ]
 
-  if (use_seccomp_bpf) {
+  if (!is_nacl_nonsfi) {
+    sources += [
+      "tests/test_utils.cc",
+      "tests/test_utils.h",
+    ]
+  }
+
+  if (use_seccomp_bpf || is_nacl_nonsfi) {
     sources += [
       "seccomp-bpf/bpf_tester_compatibility_delegate.h",
       "seccomp-bpf/bpf_tests.h",