Prevent existing card number to be used for new credit cards in the Payment Request

components/autofill/core/browser/personal_data_manager.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/personal_data_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 744 matching lines @@
   Refresh();
 }
 
 CreditCard* PersonalDataManager::GetCreditCardByGUID(const std::string& guid) {
   const std::vector<CreditCard*>& credit_cards = GetCreditCards();
   std::vector<CreditCard*>::const_iterator iter =
       FindElementByGUID<CreditCard>(credit_cards, guid);
   return iter != credit_cards.end() ? *iter : nullptr;
 }
 
+CreditCard* PersonalDataManager::GetCreditCardByNumber(
+    const std::string& number) {
+  CreditCard numbered_card;
+  numbered_card.SetNumber(base::ASCIIToUTF16(number));
+  for (CreditCard* credit_card : GetCreditCards()) {
+    DCHECK(credit_card);
+    if (credit_card->HasSameNumberAs(numbered_card))
+      return credit_card;
+  }
+  return nullptr;
+}
+
 void PersonalDataManager::GetNonEmptyTypes(
     ServerFieldTypeSet* non_empty_types) {
   for (AutofillProfile* profile : GetProfiles())
     profile->GetNonEmptyTypes(app_locale_, non_empty_types);
   for (CreditCard* card : GetCreditCards())
     card->GetNonEmptyTypes(app_locale_, non_empty_types);
 }
 
 bool PersonalDataManager::IsDataLoaded() const {
   return is_data_loaded_;
@@ skipping 1289 matching lines @@
       existing_profiles->back().SetRawInfo(EMAIL_ADDRESS, email);
 
     AutofillMetrics::LogWalletAddressConversionType(
         AutofillMetrics::CONVERTED_ADDRESS_ADDED);
   }
 
   return guid;
 }
 
 }  // namespace autofill