[Payment Request] Sever card summary section in the credit card edit form

ios/chrome/browser/payments/payment_request_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/payments/payment_request_edit_view_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 118 matching lines @@
                 name:UIKeyboardDidShowNotification
               object:nil];
 }
 
 #pragma mark - CollectionViewController methods
 
 - (void)loadModel {
   [super loadModel];
   CollectionViewModel* model = self.collectionViewModel;
 
+  [self loadHeaderItems];
+
   // Iterate over the fields and add the respective sections and items.
   int sectionIdentifier = static_cast<int>(SectionIdentifierFirstTextField);
   for (EditorField* field in _fields) {
     [model addSectionWithIdentifier:sectionIdentifier];
     AutofillEditItem* item =
         [[AutofillEditItem alloc] initWithType:ItemTypeTextField];
     item.textFieldName = field.label;
     item.textFieldEnabled = YES;
     item.textFieldValue = field.value;
     item.required = field.isRequired;
@@ skipping 247 matching lines @@
     [self addOrRemoveErrorMessage:errorMessage
           inSectionWithIdentifier:field.sectionIdentifier];
     if (errorMessage.length)
       return NO;
 
     field.value = item.textFieldValue;
   }
   return YES;
 }
 
+- (void)loadHeaderItems {
+}
+
 - (void)loadFooterItems {
   CollectionViewModel* model = self.collectionViewModel;
 
   [model addSectionWithIdentifier:SectionIdentifierFooter];
   CollectionViewFooterItem* footerItem =
       [[CollectionViewFooterItem alloc] initWithType:ItemTypeFooter];
   footerItem.text = l10n_util::GetNSString(IDS_PAYMENTS_REQUIRED_FIELD_MESSAGE);
   [model addItem:footerItem toSectionWithIdentifier:SectionIdentifierFooter];
 }
 
@@ skipping 32 matching lines @@
     errorMessageItem.image = NativeImage(IDR_IOS_PAYMENTS_WARNING);
     errorMessageItem.accessibilityIdentifier = kWarningMessageAccessibilityID;
     [model addItem:errorMessageItem toSectionWithIdentifier:sectionIdentifier];
     NSIndexPath* indexPath = [model indexPathForItemType:ItemTypeErrorMessage
                                        sectionIdentifier:sectionIdentifier];
     [self.collectionView insertItemsAtIndexPaths:@[ indexPath ]];
   }
 }
 
 @end