[Autofill] Improve support for various credit card expiration dates.

components/autofill/core/browser/validation.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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_VALIDATION_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_VALIDATION_H_
 
 #include "base/strings/string16.h"
 
 namespace base {
 class Time;
 }  // namespace base
 
 namespace autofill {
 
 // Returns true if |year| and |month| describe a date later than |now|.
 // |year| must have 4 digits.
-bool IsValidCreditCardExpirationDate(const base::string16& year,
-                                     const base::string16& month,
-                                     const base::Time& now);
 bool IsValidCreditCardExpirationDate(int year,
                                      int month,
                                      const base::Time& now);
 
 // Returns true if |text| looks like a valid credit card number.
 // Uses the Luhn formula to validate the number.
 bool IsValidCreditCardNumber(const base::string16& text);
 
 // Returns true if |text| looks like a valid credit card security code.
 bool IsValidCreditCardSecurityCode(const base::string16& text);
@@ skipping 13 matching lines @@
 // Returns true if |text| looks like a valid zip code.
 // Valid for US zip codes only.
 bool IsValidZip(const base::string16& text);
 
 // Returns true if |text| looks like an SSN, with or without separators.
 bool IsSSN(const base::string16& text);
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_VALIDATION_H_