Avoid conversion of index to BookmarkNode pointer unnacessarily.

chrome/browser/ui/bookmarks/recently_used_folders_combo_model_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/bookmarks/recently_used_folders_combo_model.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
@@ skipping 92 matching lines @@
   const BookmarkNode* sub_folder = GetModel()->AddFolder(
       folder, 0, base::ASCIIToUTF16("b"));
   const BookmarkNode* new_node = GetModel()->AddURL(
       sub_folder, 0, base::ASCIIToUTF16("a"), GURL("http://a"));
   RecentlyUsedFoldersComboModel model(GetModel(), new_node);
   TestComboboxModelObserver observer;
   model.AddObserver(&observer);
 
   const int initial_count = model.GetItemCount();
   // Remove a folder, it should remove an item from the model too.
-  GetModel()->Remove(folder, folder->GetIndexOf(sub_folder));
+  GetModel()->Remove(sub_folder);
   EXPECT_TRUE(observer.GetAndClearChanged());
   const int updated_count = model.GetItemCount();
   EXPECT_LT(updated_count, initial_count);
 
   // Remove all, which should remove a folder too.
   GetModel()->RemoveAllUserBookmarks();
   EXPECT_TRUE(observer.GetAndClearChanged());
   EXPECT_LT(model.GetItemCount(), updated_count);
 
   model.RemoveObserver(&observer);
 }