Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/autofill/card_unmask_prompt_view_bridge.mm

 // Copyright 2015 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.
 
 #include "ios/chrome/browser/ui/autofill/card_unmask_prompt_view_bridge.h"
 
 #include "base/bind.h"
 #include "base/ios/ios_util.h"
 #include "base/location.h"
 #include "base/mac/foundation_util.h"
@@ skipping 184 matching lines @@
     NSForegroundColorAttributeName : [UIColor lightGrayColor]
   }
                                forState:UIControlStateDisabled];
   [_verifyButton setEnabled:NO];
   self.navigationItem.rightBarButtonItem = _verifyButton;
 }
 
 - (void)viewWillLayoutSubviews {
   [super viewWillLayoutSubviews];
   NSIndexPath* CVCIndexPath =
-      [self.collectionViewModel indexPathForItem:_CVCItem
-                         inSectionWithIdentifier:SectionIdentifierMain];
+      [self.collectionViewModel indexPathForItem:_CVCItem];
   CVCCell* CVC = base::mac::ObjCCastStrict<CVCCell>(
       [self.collectionView cellForItemAtIndexPath:CVCIndexPath]);
   [self focusInputIfNeeded:CVC];
 }
 
 #pragma mark - CollectionViewController
 
 - (void)loadModel {
   [super loadModel];
   CollectionViewModel* model = self.collectionViewModel;
@@ skipping 85 matching lines @@
     // Remove all the present items to replace them with the status item.
     [self.collectionViewModel
         removeSectionWithIdentifier:SectionIdentifierMain];
     [self.collectionViewModel addSectionWithIdentifier:SectionIdentifierMain];
     [self.collectionViewModel addItem:_statusItem
               toSectionWithIdentifier:SectionIdentifierMain];
     [self.collectionView reloadData];
   } else {
     _statusItem.text = text;
     _statusItem.state = state;
-    [self reconfigureCellsForItems:@[ _statusItem ]
-           inSectionWithIdentifier:SectionIdentifierMain];
+    [self reconfigureCellsForItems:@[ _statusItem ]];
     [self.collectionViewLayout invalidateLayout];
   }
 }
 
 - (CGFloat)statusCellHeight {
   const CGFloat collectionViewWidth =
       CGRectGetWidth(self.collectionView.bounds);
 
   // The status cell replaces the previous content of the collection. So it is
   // sized based on what appears when not loading.
@@ skipping 74 matching lines @@
 
   if ([self inputExpirationIsValid:item]) {
     item.showDateInputError = NO;
     item.errorMessage = @"";
   } else {
     item.showDateInputError = NO;
     item.errorMessage = l10n_util::GetNSString(
         IDS_AUTOFILL_CARD_UNMASK_INVALID_EXPIRATION_DATE);
   }
 
-  [self reconfigureCellsForItems:@[ item ]
-         inSectionWithIdentifier:SectionIdentifierMain];
+  [self reconfigureCellsForItems:@[ item ]];
   [self.collectionViewLayout invalidateLayout];
 }
 
 - (void)focusInputIfNeeded:(CVCCell*)CVC {
   // Focus the first visible input, unless the orientation is landscape. In
   // landscape, the keyboard covers up the storage checkbox shown below this
   // view and the user might never see it.
   if (UIInterfaceOrientationIsPortrait(
           [UIApplication sharedApplication].statusBarOrientation)) {
     // Also check whether any of the inputs are already the first responder and
@@ skipping 62 matching lines @@
       SysUTF16ToNSString(_bridge->GetController()->GetInstructionsMessage());
   _CVCItem.monthText = @"";
   _CVCItem.yearText = @"";
   _CVCItem.CVCText = @"";
   _CVCItem.errorMessage = @"";
   _CVCItem.showDateInput = YES;
   _CVCItem.showNewCardButton = NO;
   _CVCItem.showDateInputError = NO;
   _CVCItem.showCVCInputError = NO;
 
-  [self reconfigureCellsForItems:@[ _CVCItem ]
-         inSectionWithIdentifier:SectionIdentifierMain];
+  [self reconfigureCellsForItems:@[ _CVCItem ]];
   [self.collectionViewLayout invalidateLayout];
 
   [self inputsDidChange:_CVCItem];
 }
 
 #pragma mark - UITextField Events
 
 - (void)monthInputDidChange:(UITextField*)textField {
   _CVCItem.monthText = textField.text;
   [self inputsDidChange:_CVCItem];
@@ skipping 84 matching lines @@
 - (void)collectionView:(UICollectionView*)collectionView
        willDisplayCell:(UICollectionViewCell*)cell
     forItemAtIndexPath:(NSIndexPath*)indexPath {
   CVCCell* CVC = base::mac::ObjCCast<CVCCell>(cell);
   if (CVC) {
     [self focusInputIfNeeded:CVC];
   }
 }
 
 @end