ui/base/models: Add empty() accessor to TreeNode class.

chrome/browser/importer/profile_writer.cc

 // Copyright (c) 2011 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/importer/profile_writer.h"
 
 #include <string>
 
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
@@ skipping 105 matching lines @@
                                  const string16& top_level_folder_name) {
   if (bookmarks.empty())
     return;
 
   BookmarkModel* model = profile_->GetBookmarkModel();
   DCHECK(model->IsLoaded());
 
   // If the bookmark bar is currently empty, we should import directly to it.
   // Otherwise, we should import everything to a subfolder.
   const BookmarkNode* bookmark_bar = model->GetBookmarkBarNode();
-  bool import_to_top_level = bookmark_bar->child_count() == 0;
+  bool import_to_top_level = bookmark_bar->empty();
 
   // If the user currently has no bookmarks in the bookmark bar, make sure that
   // at least some of the imported bookmarks end up there.  Otherwise, we'll end
   // up with just a single folder containing the imported bookmarks, which makes
   // for unnecessary nesting.
   bool add_all_to_top_level = import_to_top_level;
   for (std::vector<BookmarkEntry>::const_iterator it = bookmarks.begin();
        it != bookmarks.end() && add_all_to_top_level; ++it) {
     if (it->in_toolbar)
       add_all_to_top_level = false;
@@ skipping 193 matching lines @@
       if (default_keyword && TemplateURL::SupportsReplacement(t_url))
         model->SetDefaultSearchProvider(t_url);
     } else {
       // Don't add invalid TemplateURLs to the model.
       delete t_url;
     }
   }
 }
 
 ProfileWriter::~ProfileWriter() {}