Add GetDefaultIndex() to ComboboxModel.

chrome/browser/bookmarks/recently_used_folders_combo_model.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/bookmarks/recently_used_folders_combo_model.h"
 
 #include "chrome/browser/bookmarks/bookmark_utils.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
@@ skipping 47 matching lines @@
   return static_cast<int>(nodes_.size() + 1);
 }
 
 string16 RecentlyUsedFoldersComboModel::GetItemAt(int index) {
   if (index == static_cast<int>(nodes_.size()))
     return
        l10n_util::GetStringUTF16(IDS_BOOKMARK_BUBBLE_CHOOSER_ANOTHER_FOLDER);
   return nodes_[index]->GetTitle();
 }
 
+int RecentlyUsedFoldersComboModel::GetDefaultIndex() const {
+  return node_parent_index_;
+}
+
 const BookmarkNode* RecentlyUsedFoldersComboModel::GetNodeAt(int index) {
   if (index < 0 || index >= static_cast<int>(nodes_.size()))
     return NULL;
   return nodes_[index];
 }
 
 void RecentlyUsedFoldersComboModel::RemoveNode(const BookmarkNode* node) {
   std::vector<const BookmarkNode*>::iterator it = std::find(nodes_.begin(),
                                                             nodes_.end(),
                                                             node);
   if (it != nodes_.end())
     nodes_.erase(it);
 }