Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/settings/accounts_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/accounts_collection_view_controller.h"
 
 #import "base/mac/foundation_util.h"
 #include "base/metrics/user_metrics.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 628 matching lines @@
   [self chromeExecuteCommand:command];
 }
 
 #pragma mark - ChromeIdentityServiceObserver
 
 - (void)onProfileUpdate:(ChromeIdentity*)identity {
   CollectionViewAccountItem* item =
       base::mac::ObjCCastStrict<CollectionViewAccountItem>(
           [_identityMap objectForKey:identity.gaiaID]);
   [self updateAccountItem:item withIdentity:identity];
-  NSIndexPath* indexPath =
-      [self.collectionViewModel indexPathForItem:item
-                         inSectionWithIdentifier:SectionIdentifierAccounts];
+  NSIndexPath* indexPath = [self.collectionViewModel indexPathForItem:item];
   [self.collectionView reloadItemsAtIndexPaths:@[ indexPath ]];
 }
 
 - (void)onChromeIdentityServiceWillBeDestroyed {
   _identityServiceObserver.reset();
 }
 
 @end