[Autofill] Autofill fails to fill credit card number when split across fields.

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 bf45e7ee6efb0194481158448104546b07e9ff85..1fb24de3758366b6440d0d98b1ba52aaa2d85cc4 100644
--- a/components/autofill/core/browser/credit_card_field.h
+++ b/components/autofill/core/browser/credit_card_field.h
@@ -44,7 +44,11 @@ class CreditCardField : public FormField {
 
   // TODO(jhawkins): Parse the select control.
   const AutofillField* type_;  // Optional.
-  const AutofillField* number_;  // Required.
+  const AutofillField* number_full_;   // Required.
+  const AutofillField* number_part1_;  // Optional.
+  const AutofillField* number_part2_;  // Optional.
+  const AutofillField* number_part3_;  // Optional.
+  const AutofillField* number_part4_;  // Optional.
 
   // The 3-digit card verification number; we don't currently fill this.
   const AutofillField* verification_;