Do not reload UI if the Reading List entry does not exist

ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm

Index: ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm b/ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm
index 45ddedcb46aa2cbe98740f295fb18d39eb02665a..731467f002d1020f911fa0457b4755e9a8afa24d 100644
--- a/ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm
+++ b/ios/chrome/browser/ui/reading_list/reading_list_collection_view_controller.mm
@@ -120,7 +120,7 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
 // Stops observing the ReadingListModel.
 - (void)stopObservingReadingListModel;
 // Returns the ReadingListEntry associated with the |item|. If there is not such
-// an entry, returns nullptr and reloads the UI.
+// an entry, returns nullptr.
 - (const ReadingListEntry*)readingListEntryForItem:
     (ReadingListCollectionViewItem*)item;
 // Updates the toolbar state according to the selected items.
@@ -695,12 +695,6 @@ using ItemsMapByDate = std::multimap<int64_t, ReadingListCollectionViewItem*>;
   const ReadingListEntry* readingListEntry =
       self.readingListModel->GetEntryByURL(item.url);
 
-  if (!readingListEntry) {
-    // The entry has been removed from the model, reload all data to synchronize
-    // the UI with the model.
-    [self reloadData];
-  }
-
   return readingListEntry;
 }