[Payment Request] Populates region field if region code/name is valid.

ios/chrome/browser/ui/payments/address_edit_mediator.h

Index: ios/chrome/browser/ui/payments/address_edit_mediator.h
diff --git a/ios/chrome/browser/ui/payments/address_edit_mediator.h b/ios/chrome/browser/ui/payments/address_edit_mediator.h
index cae21460ea9c6aa95d6c84a228a45e9a7872d8c1..84cad803aa0d626fd81ffd6adf56e73324703d50 100644
--- a/ios/chrome/browser/ui/payments/address_edit_mediator.h
+++ b/ios/chrome/browser/ui/payments/address_edit_mediator.h
@@ -30,9 +30,6 @@ class AutofillProfile;
 // The country code for the currently selected country, if any.
 @property(nonatomic, strong) NSString* selectedCountryCode;
 
-// The list of region names used for the autofill::ADDRESS_HOME_STATE field.
-@property(nonatomic, strong) NSArray<NSString*>* regions;
-
 // Initializes this object with an instance of PaymentRequest which has a copy
 // of web::PaymentRequest as provided by the page invoking the Payment Request
 // API as well as |address| which is the address to be edited, if any.