[Payment Request] Refactors the edit view controller

ios/showcase/payments/sc_payments_picker_coordinator.mm

 // 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.
 
 #import "ios/showcase/payments/sc_payments_picker_coordinator.h"
 
 #import "ios/chrome/browser/ui/payments/payment_request_picker_row.h"
 #import "ios/chrome/browser/ui/payments/payment_request_picker_view_controller.h"
 #import "ios/showcase/common/protocol_alerter.h"
 
@@ skipping 20 matching lines @@
     @protocol(PaymentRequestPickerViewControllerDelegate)
   ]];
   self.alerter.baseViewController = self.baseViewController;
 
   NSArray<PickerRow*>* rows = [self rows];
   _pickerViewController = [[PaymentRequestPickerViewController alloc]
       initWithRows:rows
           selected:rows[rows.count - 1]];
   [_pickerViewController setTitle:@"Select a country"];
   [_pickerViewController
-      setDelegate:reinterpret_cast<
-                      id<PaymentRequestPickerViewControllerDelegate>>(
+      setDelegate:static_cast<id<PaymentRequestPickerViewControllerDelegate>>(
                       self.alerter)];
 
   [self.baseViewController pushViewController:_pickerViewController
                                      animated:YES];
 }
 
 #pragma mark - Helper methods
 
 - (NSArray<PickerRow*>*)rows {
   return @[
     [[PickerRow alloc] initWithLabel:@"Chile" value:@"CHL"],
     [[PickerRow alloc] initWithLabel:@"Canada" value:@"CAN"],
     [[PickerRow alloc] initWithLabel:@"Belgium" value:@"BEL"],
     [[PickerRow alloc] initWithLabel:@"España" value:@"ESP"],
     [[PickerRow alloc] initWithLabel:@"México" value:@"MEX"],
     [[PickerRow alloc] initWithLabel:@"Brazil" value:@"BRA"],
     [[PickerRow alloc] initWithLabel:@"China" value:@"CHN"]
   ];
 }
 
 @end