[NTP Snippets] Bookmark suggestions: remove creation_date_fallback

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h

Index: components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
diff --git a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
index 0b908e5e4ef85dc9df4a2ca14239989c071f8f9d..fdbdbc97fe8a71e269279c95f14a8c39640c91ac 100644
--- a/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
+++ b/components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h
@@ -110,11 +110,6 @@ class BookmarkSuggestionsProvider : public ContentSuggestionsProvider,
   base::Time node_to_change_last_visit_date_;
   base::Time end_of_list_last_visit_date_;
 
-  // TODO(jkrcal): Remove this field and the pref after M55.
-  // For six weeks after first installing M54, this is true and the
-  // fallback implemented in BookmarkLastVisitUtils is activated.
-  bool creation_date_fallback_;
-
   // By default, only visits to bookmarks on Android are considered when
   // deciding which bookmarks to suggest. Should we also consider visits on
   // desktop platforms?