Remove unused fields found by clang's new Wunused-private-fields.

chrome/browser/locale_tests_browsertest.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 "base/command_line.h"
 #include "base/environment.h"
 #include "build/build_config.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "ui/base/ui_base_switches.h"
 
@@ skipping 37 matching lines @@
     } else {
       env->UnSetVar("LC_ALL");
     }
 #endif
   }
 
   const std::string& locale() { return locale_; }
 
  private:
   std::string locale_;
+#if defined(OS_LINUX)
   const char* old_locale_;
+#endif
 };
 
 // A base class for tests used in this file. This class over-writes the system
 // locale and run Chrome with a '--lang' option. To add a new LocaleTest, add a
 // class derived from this class and call the constructor with the locale name
 // used by Chrome.
 class LocaleTestBase : public InProcessBrowserTest {
  public:
   explicit LocaleTestBase(const char* locale) : locale_(locale) {
   }
@@ skipping 33 matching lines @@
 // code here because they just verify we can start Chrome and shut it down
 // cleanly on these locales.
 IN_PROC_BROWSER_TEST_F(LocaleTestDanish, TestStart) {
 }
 
 IN_PROC_BROWSER_TEST_F(LocaleTestHebrew, TestStart) {
 }
 
 IN_PROC_BROWSER_TEST_F(LocaleTestTraditionalChinese, TestStart) {
 }