Fixed all unused-variable Clang warnings on Windows.

chrome/installer/util/google_update_settings_unittest.cc

 // 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.
 
 #include "chrome/installer/util/google_update_settings.h"
 
 #include <windows.h>
 #include <shlwapi.h>  // For SHDeleteKey.
 
 #include "base/base_paths.h"
@@ skipping 14 matching lines @@
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/work_item_list.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::win::RegKey;
 using installer::ChannelInfo;
 
 namespace {
 
 const wchar_t kTestProductGuid[] = L"{89F1B351-B15D-48D4-8F10-1298721CF13D}";
+
+#if defined(GOOGLE_CHROME_BUILD)
 const wchar_t kTestExperimentLabel[] = L"test_label_value";
+#endif
 
 // This test fixture redirects the HKLM and HKCU registry hives for
 // the duration of the test to make it independent of the machine
 // and user settings.
 class GoogleUpdateSettingsTest : public testing::Test {
  protected:
   enum SystemUserInstall {
     SYSTEM_INSTALL,
     USER_INSTALL,
   };
@@ skipping 1311 matching lines @@
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::FALSE_SETTING, StatsState::FALSE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::FALSE_SETTING, StatsState::TRUE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::NO_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::FALSE_SETTING),
         StatsState(StatsState::kSystemLevel, StatsState::MULTI_INSTALL,
                    StatsState::TRUE_SETTING, StatsState::TRUE_SETTING)));