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

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_CHROME_BROWSER_UI_PAYMENTS_ADDRESS_EDIT_MEDIATOR_H_
 #define IOS_CHROME_BROWSER_UI_PAYMENTS_ADDRESS_EDIT_MEDIATOR_H_
 
 #import "ios/chrome/browser/ui/payments/payment_request_edit_view_controller_data_source.h"
 #import "ios/chrome/browser/ui/payments/region_data_loader.h"
 
@@ skipping 12 matching lines @@
 // The consumer for this object. This can change during the lifetime of this
 // object and may be nil.
 @property(nonatomic, weak) id<PaymentRequestEditConsumer> consumer;
 
 // The map of country codes to country names.
 @property(nonatomic, strong) NSDictionary<NSString*, NSString*>* countries;
 
 // 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.
 // This object will not take ownership of |paymentRequest| or |address|.
 - (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest
                                address:(autofill::AutofillProfile*)address
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_ADDRESS_EDIT_MEDIATOR_H_