[Autofill] Add a separate enumeration for HTML field type hints.

components/autofill/core/browser/autofill_data_model.cc

Index: components/autofill/core/browser/autofill_data_model.cc
diff --git a/components/autofill/core/browser/autofill_data_model.cc b/components/autofill/core/browser/autofill_data_model.cc
index a68fda7d68719409c8c8481b45100a58c80c3204..e826eb4e1f6621cdfd5c95e2359c2e9f479ad408 100644
--- a/components/autofill/core/browser/autofill_data_model.cc
+++ b/components/autofill/core/browser/autofill_data_model.cc
@@ -158,12 +158,10 @@ void AutofillDataModel::FillSelectControl(const AutofillType& type,
     return;
   }
 
-  NativeFieldType native_type = type.native_type();
-  if (native_type == ADDRESS_HOME_STATE ||
-      native_type == ADDRESS_BILLING_STATE) {
+  NativeFieldType native_type = type.GetEquivalentNativeType();
+  if (native_type == ADDRESS_HOME_STATE) {
     FillStateSelectControl(field_text, field);
-  } else if (native_type == ADDRESS_HOME_COUNTRY ||
-             native_type == ADDRESS_BILLING_COUNTRY) {
+  } else if (native_type == ADDRESS_HOME_COUNTRY) {
     FillCountrySelectControl(app_locale, field);
   } else if (native_type == CREDIT_CARD_EXP_MONTH) {
     FillExpirationMonthSelectControl(field_text, field);