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

components/autofill/core/browser/validation.cc

 // 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 "components/autofill/core/browser/validation.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/autofill/core/browser/state_names.h"
 #include "components/autofill/core/common/autofill_regexes.h"
 
 namespace autofill {
 
-bool IsValidCreditCardExpirationDate(const base::string16& year,
-                                     const base::string16& month,
-                                     const base::Time& now) {
-  base::string16 year_cleaned, month_cleaned;
-  base::TrimWhitespace(year, base::TRIM_ALL, &year_cleaned);
-  base::TrimWhitespace(month, base::TRIM_ALL, &month_cleaned);
-  if (year_cleaned.length() != 4)
-    return false;
-
-  int cc_year;
-  if (!base::StringToInt(year_cleaned, &cc_year))
-    return false;
-
-  int cc_month;
-  if (!base::StringToInt(month_cleaned, &cc_month))
-    return false;
-
-  return IsValidCreditCardExpirationDate(cc_year, cc_month, now);
-}
-
 bool IsValidCreditCardExpirationDate(int year,
                                      int month,
                                      const base::Time& now) {
   if (month < 1 || month > 12)
     return false;
 
   base::Time::Exploded now_exploded;
   now.LocalExplode(&now_exploded);
 
   if (year < now_exploded.year)
@@ skipping 154 matching lines @@
                                              number_string.begin() + 9),
                          &serial)
       || serial == 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace autofill