Allow CollectionViewModel/Controller queries without SectionIdentifier

ios/chrome/browser/ui/collection_view/collection_view_controller.mm

Index: ios/chrome/browser/ui/collection_view/collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/collection_view/collection_view_controller.mm b/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
index cbdc9d81cc656e0cdb37f362a3ea3ef7168948b1..ec605142f49c3b86477bf4d7a03eb44a1f24e1f7 100644
--- a/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
+++ b/ios/chrome/browser/ui/collection_view/collection_view_controller.mm
@@ -71,6 +71,13 @@
   }
 }
 
+- (void)reconfigureCellsForItems:(NSArray*)items {
+  for (CollectionViewItem* item in items) {
+    NSIndexPath* indexPath = [self.collectionViewModel indexPathForItem:item];
+    [self reconfigureCellAtIndexPath:indexPath withItem:item];
+  }
+}
+
 - (void)reconfigureCellsAtIndexPaths:(NSArray*)indexPaths {
   for (NSIndexPath* indexPath in indexPaths) {
     CollectionViewItem* item =