aura: Do not include test code in production code.

ui/aura/test/window_test_api.h

+// Copyright 2013 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.
+
+#ifndef UI_AURA_TEST_WINDOW_TEST_API_H_
+#define UI_AURA_TEST_WINDOW_TEST_API_H_
+
+#include "base/basictypes.h"
+
+namespace aura {
+
+class Window;
+
+namespace test {
+
+class WindowTestApi {
+ public:
+  explicit WindowTestApi(Window* window);
+
+  bool OwnsLayer() const;
+
+  bool ContainsMouse() const;
+
+ private:
+  Window* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowTestApi);
+};
+
+}  // namespace test
+}  // namespace aura
+
+#endif  // UI_AURA_TEST_WINDOW_TEST_API_H_