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

chrome/browser/bookmarks/bookmark_model.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/bookmarks/bookmark_model.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/callback.h"
@@ skipping 50 matching lines @@
 void BookmarkNode::InvalidateFavicon() {
   loaded_favicon_ = false;
   favicon_ = SkBitmap();
 }
 
 bool BookmarkNode::IsVisible() const {
   // The synced bookmark folder is invisible if the flag isn't set and there are
   // no bookmarks under it.
   if (type_ != BookmarkNode::SYNCED ||
       CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableSyncedBookmarksFolder) ||
-      child_count() > 0) {
+          switches::kEnableSyncedBookmarksFolder) || !empty()) {
     return true;
   }
   return false;
 }
 
 void BookmarkNode::Reset(const history::StarredEntry& entry) {
   DCHECK(entry.type != history::StarredEntry::URL || entry.url == url_);
 
   favicon_ = SkBitmap();
   switch (entry.type) {
@@ skipping 771 matching lines @@
 }
 
 BookmarkLoadDetails* BookmarkModel::CreateLoadDetails() {
   BookmarkNode* bb_node = CreateBookmarkNode();
   BookmarkNode* other_folder_node = CreateOtherBookmarksNode();
   BookmarkNode* synced_folder_node = CreateSyncedBookmarksNode();
   return new BookmarkLoadDetails(
       bb_node, other_folder_node, synced_folder_node,
       new BookmarkIndex(profile()), next_node_id_);
 }