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diff --git a/base/i18n/timezone.h b/base/i18n/timezone.h
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+++ b/base/i18n/timezone.h
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+// 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 BASE_I18N_TIMEZONE_H_
+#define BASE_I18N_TIMEZONE_H_
+
+#include <string>
+
+#include "base/i18n/base_i18n_export.h"
+
+namespace base {
+
+// Checks the system timezone and turns it into a two-character ISO 3166 country
+// code. This may fail (for example, it used to always fail on Android), in
+// which case it will return an empty string. It'll also return an empty string
+// when the timezone is Etc/UTC or Etc/UCT, but will return 'GB" for Etc/GMT
+// because people in the UK tends to select Etc/GMT by mistake instead of
+// Europe/London (British Time).
+BASE_I18N_EXPORT std::string CountryCodeForCurrentTimezone();
+
+}  // namespace base
+
+#endif  // BASE_I18N_TIMEZONE_H_