Allow CollectionViewModel/Controller queries without SectionIdentifier

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 224 matching lines @@
 
   // 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];
 
-    NSInteger sectionIdentifier = [self.collectionViewModel
-        sectionIdentifierForSection:[indexPath section]];
     // Update the cell.
-    [self reconfigureCellsForItems:@[ item ]
-           inSectionWithIdentifier:sectionIdentifier];
+    [self reconfigureCellsForItems:@[ item ]];
   }
 
   return YES;
 }
 
 #pragma mark - UICollectionViewDataSource
 
 - (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
                  cellForItemAtIndexPath:(NSIndexPath*)indexPath {
   UICollectionViewCell* cell =
@@ skipping 96 matching lines @@
   }
 }
 
 #pragma mark Switch Actions
 
 - (void)saveCardSwitchToggled:(UISwitch*)sender {
   _saveCreditCard = sender.isOn;
 }
 
 @end