[Autofill] Move IsValidState() into validation.h

components/autofill/browser/state_names.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.
+
+#include "base/string16.h"
+
+#ifndef COMPONENTS_AUTOFILL_BROWSER_STATE_NAMES_H_
+#define COMPONENTS_AUTOFILL_BROWSER_STATE_NAMES_H_
+
+namespace autofill {
+namespace state_names {
+
+// Returns the abbrevation corresponding to the state named |name|, or the empty
+// string if there is no such state.
+base::string16 GetAbbreviationForName(const base::string16& name);
+
+// Returns the full state name corresponding to the |abbrevation|, or the empty
+// string if there is no such state.
+base::string16 GetNameForAbbreviation(const base::string16& abbreviation);
+
+}  // namespace state_names
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_BROWSER_STATE_NAMES_H_