Avoid conversion of index to BookmarkNode pointer unnacessarily.

components/undo/bookmark_undo_service.cc

 // Copyright 2013 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.
 
 #include "components/undo/bookmark_undo_service.h"
 
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/browser/bookmark_node_data.h"
 #include "components/bookmarks/browser/bookmark_utils.h"
 #include "components/bookmarks/browser/scoped_group_bookmark_actions.h"
@@ skipping 66 matching lines @@
       parent_id_(parent->id()),
       index_(index) {
 }
 
 void BookmarkAddOperation::Undo() {
   BookmarkModel* model = bookmark_model();
   const BookmarkNode* parent =
       bookmarks::GetBookmarkNodeByID(model, parent_id_);
   DCHECK(parent);
 
-  model->Remove(parent, index_);
+  model->Remove(parent->GetChild(index_));
 }
 
 int BookmarkAddOperation::GetUndoLabelId() const {
   return IDS_BOOKMARK_BAR_UNDO_ADD;
 }
 
 int BookmarkAddOperation::GetRedoLabelId() const {
   return IDS_BOOKMARK_BAR_REDO_DELETE;
 }
 
@@ skipping 388 matching lines @@
 }
 
 void BookmarkUndoService::OnBookmarkRenumbered(int64 old_id, int64 new_id) {
   std::vector<UndoOperation*> all_operations =
       undo_manager()->GetAllUndoOperations();
   for (UndoOperation* op : all_operations) {
     static_cast<BookmarkUndoOperation*>(op)
         ->OnBookmarkRenumbered(old_id, new_id);
   }
 }