Use RegistryOverrideManager properly in RLZ tests.

rlz/test/rlz_test_helpers.h

 // Copyright (c) 2012 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.
 //
 // Helper functions used by the tests.
 
 #ifndef RLZ_TEST_RLZ_TEST_HELPERS_H
 #define RLZ_TEST_RLZ_TEST_HELPERS_H
 
 #include "base/compiler_specific.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_POSIX)
 #include "base/files/scoped_temp_dir.h"
 #endif
 
+#if defined(OS_WIN)
+#include "base/test/test_reg_util_win.h"
+#endif
+
 class RlzLibTestNoMachineState : public ::testing::Test {
  protected:
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
+#if defined(OS_POSIX)
+  base::ScopedTempDir temp_dir_;
+#endif
 
-#if defined(OS_POSIX)
- base::ScopedTempDir temp_dir_;
+#if defined(OS_WIN)
+  registry_util::RegistryOverrideManager override_manager_;
 #endif
 };
 
 class RlzLibTestBase : public RlzLibTestNoMachineState {
+ protected:
   virtual void SetUp() OVERRIDE;
 };
 
-
 #endif  // RLZ_TEST_RLZ_TEST_HELPERS_H