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

components/autofill/core/browser/personal_data_manager.h

Index: components/autofill/core/browser/personal_data_manager.h
diff --git a/components/autofill/core/browser/personal_data_manager.h b/components/autofill/core/browser/personal_data_manager.h
index c2ca03c8810c6e757425b3ea43a46df91e65f908..ac29f283ac52340af942ed12eaabb3da745200e3 100644
--- a/components/autofill/core/browser/personal_data_manager.h
+++ b/components/autofill/core/browser/personal_data_manager.h
@@ -184,6 +184,10 @@ class PersonalDataManager : public KeyedService,
   // no credit card with the specified |guid|.
   virtual CreditCard* GetCreditCardByGUID(const std::string& guid);
 
+  // Returns the credit card with the specified |number|, or nullptr if there is
+  // no credit card with the specified |number|.
+  virtual CreditCard* GetCreditCardByNumber(const std::string& number);
+
   // Gets the field types availabe in the stored address and credit card data.
   void GetNonEmptyTypes(ServerFieldTypeSet* non_empty_types);