[Payment Request] Refactors edit view controller

ios/chrome/browser/ui/payments/address_edit_mediator.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/chrome/browser/ui/payments/address_edit_mediator.h"
 
 #include <map>
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 100 matching lines @@
 #pragma mark - CreditCardEditViewControllerDataSource
 
 - (CollectionViewItem*)headerItem {
   return nil;
 }
 
 - (BOOL)shouldHideBackgroundForHeaderItem {
   return NO;
 }
 
+- (UIImage*)iconIdentifyingEditorField:(EditorField*)field {
+  return nil;
+}
+
 #pragma mark - RegionDataLoaderConsumer
 
 - (void)regionDataLoaderDidSucceedWithRegions:
     (NSMutableArray<NSString*>*)regions {
   self.regions = regions;
   // Enable the previously disabled field and reset its value to the first
   // region or nil, if there are no regions.
   self.regionField.enabled = YES;
   self.regionField.value = regions.count ? regions[0] : nil;
 
@@ skipping 141 matching lines @@
                          value:nil
                       required:YES];
     [self.fieldsMap setObject:field forKey:phoneNumberFieldKey];
   }
   [self.fields addObject:field];
 
   return self.fields;
 }
 
 @end