Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/settings/privacy_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/privacy_collection_view_controller.h"
 
 #include "base/ios/ios_util.h"
 #import "base/ios/weak_nsobject.h"
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
@@ skipping 429 matching lines @@
 
 #pragma mark - BooleanObserver
 
 - (void)booleanDidChange:(id<ObservableBoolean>)observableBoolean {
   DCHECK_EQ(observableBoolean, _suggestionsEnabled.get());
 
   // Update the item.
   _showSuggestionsItem.get().on = [_suggestionsEnabled value];
 
   // Update the cell.
-  [self reconfigureCellsForItems:@[ _showSuggestionsItem ]
-         inSectionWithIdentifier:SectionIdentifierWebServices];
+  [self reconfigureCellsForItems:@[ _showSuggestionsItem ]];
 }
 
 #pragma mark - Actions
 
 - (void)showSuggestionsToggled:(UISwitch*)sender {
   NSIndexPath* switchPath = [self.collectionViewModel
       indexPathForItemType:ItemTypeWebServicesShowSuggestions
          sectionIdentifier:SectionIdentifierWebServices];
 
   CollectionViewSwitchItem* switchItem =
@@ skipping 11 matching lines @@
 
 #pragma mark - PrefObserverDelegate
 
 - (void)onPreferenceChanged:(const std::string&)preferenceName {
   if (preferenceName == prefs::kIosHandoffToOtherDevices) {
     NSString* detailText =
         _browserState->GetPrefs()->GetBoolean(prefs::kIosHandoffToOtherDevices)
             ? l10n_util::GetNSString(IDS_IOS_SETTING_ON)
             : l10n_util::GetNSString(IDS_IOS_SETTING_OFF);
     _handoffDetailItem.get().detailText = detailText;
-    [self reconfigureCellsForItems:@[ _handoffDetailItem ]
-           inSectionWithIdentifier:SectionIdentifierOtherDevices];
+    [self reconfigureCellsForItems:@[ _handoffDetailItem ]];
     return;
   }
 
   if (preferenceName == metrics::prefs::kMetricsReportingEnabled ||
       preferenceName == prefs::kMetricsReportingWifiOnly) {
     NSString* detailText = [DataplanUsageCollectionViewController
         currentLabelForPreference:GetApplicationContext()->GetLocalState()
                          basePref:metrics::prefs::kMetricsReportingEnabled
                          wifiPref:prefs::kMetricsReportingWifiOnly];
 
     _sendUsageDetailItem.get().detailText = detailText;
 
-    [self reconfigureCellsForItems:@[ _sendUsageDetailItem ]
-           inSectionWithIdentifier:SectionIdentifierWebServices];
+    [self reconfigureCellsForItems:@[ _sendUsageDetailItem ]];
     return;
   }
 }
 
 @end