Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/settings/block_popups_collection_view_controller.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.
 
 #import "ios/chrome/browser/ui/settings/block_popups_collection_view_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
@@ skipping 209 matching lines @@
 
 #pragma mark - BooleanObserver
 
 - (void)booleanDidChange:(id<ObservableBoolean>)observableBoolean {
   DCHECK_EQ(observableBoolean, _disablePopupsSetting);
 
   // Update the item.
   _blockPopupsItem.on = [_disablePopupsSetting value];
 
   // Update the cell.
-  [self reconfigureCellsForItems:@[ _blockPopupsItem ]
-         inSectionWithIdentifier:SectionIdentifierMainSwitch];
+  [self reconfigureCellsForItems:@[ _blockPopupsItem ]];
 
   // Update the rest of the UI.
   [self.editor setEditing:NO];
   [self updateEditButton];
   [self layoutSections:[_disablePopupsSetting value]];
 }
 
 #pragma mark - Actions
 
 - (void)blockPopupsSwitchChanged:(UISwitch*)switchView {
@@ skipping 98 matching lines @@
       [[strongSelf collectionViewModel]
           removeSectionWithIdentifier:SectionIdentifierExceptions];
       [[strongSelf collectionView]
           deleteSections:[NSIndexSet indexSetWithIndex:index]];
     }
                                   completion:nil];
   }
 }
 
 @end