Update from https://crrev.com/305340

sandbox/linux/tests/test_utils_unittest.cc

Index: sandbox/linux/tests/test_utils_unittest.cc
diff --git a/sandbox/linux/tests/test_utils_unittest.cc b/sandbox/linux/tests/test_utils_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0f86e616e9ba2c9453152d74c2a8b6bd99917d65
--- /dev/null
+++ b/sandbox/linux/tests/test_utils_unittest.cc
@@ -0,0 +1,24 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/linux/tests/test_utils.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sandbox {
+
+namespace {
+
+// Check that HandlePostForkReturn works.
+TEST(TestUtils, HandlePostForkReturn) {
+  pid_t pid = fork();
+  TestUtils::HandlePostForkReturn(pid);
+}
+
+}  // namespace
+
+}  // namespace sandbox