Supporting undoing bookmark deletion without creating new ID.

components/undo/bookmark_undo_service.h

Index: components/undo/bookmark_undo_service.h
diff --git a/components/undo/bookmark_undo_service.h b/components/undo/bookmark_undo_service.h
index 8ae2eaf9af4f16c58a9a0c0f180e543215900449..90295b66c864cf75847cf4c2bc343454a66d821c 100644
--- a/components/undo/bookmark_undo_service.h
+++ b/components/undo/bookmark_undo_service.h
@@ -11,7 +11,6 @@
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
 #include "components/bookmarks/browser/bookmark_node_data.h"
 #include "components/keyed_service/core/keyed_service.h"
-#include "components/undo/bookmark_renumber_observer.h"
 #include "components/undo/undo_manager.h"
 
 namespace bookmarks {
@@ -24,8 +23,7 @@ class BookmarkModelObserver;
 // BookmarkUndoService is owned by the profile, and is responsible for observing
 // BookmarkModel changes in order to provide an undo for those changes.
 class BookmarkUndoService : public bookmarks::BaseBookmarkModelObserver,
-                            public KeyedService,
-                            public BookmarkRenumberObserver {
+                            public KeyedService {
  public:
   BookmarkUndoService();
   ~BookmarkUndoService() override;
@@ -67,9 +65,7 @@ class BookmarkUndoService : public bookmarks::BaseBookmarkModelObserver,
       bookmarks::BookmarkModel* model) override;
   void GroupedBookmarkChangesEnded(bookmarks::BookmarkModel* model) override;
 
-  // BookmarkRenumberObserver:
-  void OnBookmarkRenumbered(int64 old_id, int64 new_id) override;
-
+  bookmarks::BookmarkModel* model_;
   UndoManager undo_manager_;
   ScopedObserver<bookmarks::BookmarkModel, bookmarks::BookmarkModelObserver>
       scoped_observer_;