Use rvalue reference instead of ExtensionBuilder::pass()

extensions/common/extension_builder_unittest.cc

+// Copyright 2015 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 <utility>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+#include "extensions/common/extension_builder.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ExtensionBuilderTest = testing::Test;
+
+namespace extensions {
+
+TEST(ExtensionBuilderTest, Basic) {
+  scoped_refptr<Extension> auto_launch_kiosk_app(
+      test_util::BuildApp(ExtensionBuilder()).Build());
+}
+
+}  // namespace extensions