Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/settings/search_engine_settings_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/search_engine_settings_collection_view_controller.h"
 
 #include <memory>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/foundation_util.h"
@@ skipping 148 matching lines @@
   // Show the checkmark on the new default engine.
   CollectionViewTextItem* newDefaultEngine =
       base::mac::ObjCCastStrict<CollectionViewTextItem>(
           [model itemAtIndexPath:indexPath]);
   newDefaultEngine.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
   [modifiedItems addObject:newDefaultEngine];
 
   // Set the new engine as the default.
   [self setValueFromIndex:[model indexInItemTypeForIndexPath:indexPath]];
 
-  [self reconfigureCellsForItems:modifiedItems
-         inSectionWithIdentifier:SectionIdentifierSearchEngines];
+  [self reconfigureCellsForItems:modifiedItems];
 }
 
 #pragma mark Internal methods
 
 - (NSArray*)allValues {
   std::vector<TemplateURL*> urls = templateURLService_->GetTemplateURLs();
   NSMutableArray* items = [NSMutableArray arrayWithCapacity:urls.size()];
   for (std::vector<TemplateURL*>::const_iterator iter = urls.begin();
        iter != urls.end(); ++iter) {
     [items addObject:base::SysUTF16ToNSString((*iter)->short_name())];
@@ skipping 14 matching lines @@
   templateURLService_->SetUserSelectedDefaultSearchProvider(urls[index]);
   updatingBackend_ = NO;
 }
 
 - (void)onChange {
   if (!updatingBackend_)
     [self reloadData];
 }
 
 @end