[Autofill] Autofill fails to show suggestions for credit card split across fields.

components/autofill/core/browser/autofill_field.h

Index: components/autofill/core/browser/autofill_field.h
diff --git a/components/autofill/core/browser/autofill_field.h b/components/autofill/core/browser/autofill_field.h
index 1c79bb2fd001fc090115c738fb06e06054185923..7a64ac72b03562a7ffe4951e42e5276b10d041a4 100644
--- a/components/autofill/core/browser/autofill_field.h
+++ b/components/autofill/core/browser/autofill_field.h
@@ -86,8 +86,14 @@ class AutofillField : public FormFieldData {
   // might be |number|, or could possibly be a prefix or suffix of |number|
   // if that's appropriate for the field.
   static base::string16 GetPhoneNumberValue(const AutofillField& field,
-                                            const base::string16& number,
-                                            const FormFieldData& field_data);
+                                            const base::string16& number);
+
+  // Returns the credit card number value for the given |field|. The returned
+  // value might be |number|, or possibly an appropriate substring of |number|
+  // for cases where credit card number splits across multiple HTML form input
+  // fields.
+  static base::string16 GetCreditCardNumberValue(const AutofillField& field,
+                                                 const base::string16& number);
 
  private:
   // The unique name of this field, generated by Autofill.