[Autofill] Fix heuristics to detect consecutive CVCs.

components/autofill/core/browser/credit_card_field.h

Index: components/autofill/core/browser/credit_card_field.h
diff --git a/components/autofill/core/browser/credit_card_field.h b/components/autofill/core/browser/credit_card_field.h
index 269a1157ff1b918e591cb8040235b695cb137320..344fac82674378c7b17109b4a47e63c61cfcd4bd 100644
--- a/components/autofill/core/browser/credit_card_field.h
+++ b/components/autofill/core/browser/credit_card_field.h
@@ -59,6 +59,10 @@ class CreditCardField : public FormField {
   // |CREDIT_CARD_EXP_2_DIGIT_YEAR|; otherwise |CREDIT_CARD_EXP_4_DIGIT_YEAR|.
   ServerFieldType GetExpirationYearType() const;
 
+  // Returns whether the expiration has been set for this credit card field.
+  // It can be either a date or both the month and the year.
+  bool HasExpiration() const;
+
   AutofillField* cardholder_;  // Optional.
 
   // Occasionally pages have separate fields for the cardholder's first and