[Payment Request] Renames a poorly named property of the AutofillEditItem.

ios/chrome/browser/ui/payments/credit_card_edit_view_controller.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/credit_card_edit_view_controller.h"
 
 #import "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/ui/autofill/autofill_ui_type.h"
@@ skipping 77 matching lines @@
 
 - (void)loadModel {
   [super loadModel];
 
   // If editing a credit card, set the card type icon (e.g. "Visa").
   if (_dataSource.state == EditViewControllerStateEdit) {
     for (EditorField* field in _fields) {
       if (field.autofillUIType == AutofillUITypeCreditCardNumber) {
         AutofillEditItem* item =
             base::mac::ObjCCastStrict<AutofillEditItem>(field.item);
-        item.cardTypeIcon =
+        item.identifyingIcon =
             [_dataSource cardTypeIconFromCardNumber:item.textFieldValue];
       }
     }
   }
 }
 
 - (void)loadFooterItems {
   CollectionViewModel* model = self.collectionViewModel;
 
   // "Save card" section. Visible only when creating a card.
@@ skipping 25 matching lines @@
   AutofillEditItem* item = base::mac::ObjCCastStrict<AutofillEditItem>(
       [self.collectionViewModel itemAtIndexPath:indexPath]);
 
   // If the user is typing in the credit card number field, update the card type
   // icon (e.g. "Visa") to reflect the number being typed.
   if (item.autofillUIType == AutofillUITypeCreditCardNumber) {
     // Obtain the text being typed.
     NSString* updatedText =
         [textField.text stringByReplacingCharactersInRange:range
                                                 withString:newText];
-    item.cardTypeIcon = [_dataSource cardTypeIconFromCardNumber:updatedText];
+    item.identifyingIcon = [_dataSource cardTypeIconFromCardNumber:updatedText];
 
     // Update the cell.
     [self reconfigureCellsForItems:@[ item ]];
   }
 
   return YES;
 }
 
 #pragma mark - UICollectionViewDataSource
 
@@ skipping 49 matching lines @@
   }
 }
 
 #pragma mark Switch Actions
 
 - (void)saveCardSwitchToggled:(UISwitch*)sender {
   _saveCreditCard = sender.isOn;
 }
 
 @end