Refactors cvc and expiration date validation in CC upload logic as well as unmask prompt.

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"
+#include "base/strings/string_piece.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(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);
-
 // Returns true if |code| looks like a valid credit card security code
-// for the type of credit card designated by |number|.
+// for the given credit card type.
 bool IsValidCreditCardSecurityCode(const base::string16& code,
-                                   const base::string16& number);
+                                   const base::StringPiece card_type);
 
 // Returns true if |text| looks like a valid e-mail address.
 bool IsValidEmailAddress(const base::string16& text);
 
 // Returns true if |text| is a valid US state name or abbreviation.  It is
 // case insensitive.  Valid for US states only.
 bool IsValidState(const base::string16& text);
 
 // 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_