Fix yet another crash with bookmarks drag&drop on Mac.

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/bind.h"
@@ skipping 402 matching lines @@
     if (!last_url || *url != *last_url)
       urls->push_back(*url);
     last_url = url;
   }
 }
 
 void BookmarkModel::BlockTillLoaded() {
   loaded_signal_.Wait();
 }
 
-const BookmarkNode* BookmarkModel::GetNodeByID(int64 id) {
+const BookmarkNode* BookmarkModel::GetNodeByID(int64 id) const {
   // TODO(sky): TreeNode needs a method that visits all nodes using a predicate.
   return GetNodeByID(&root_, id);
 }
 
 const BookmarkNode* BookmarkModel::AddFolder(const BookmarkNode* parent,
                                              int index,
                                              const string16& title) {
   if (!loaded_ || is_root_node(parent) || !IsValidIndex(parent, index, true)) {
     // Can't add to the root.
     NOTREACHED();
@@ skipping 258 matching lines @@
     details.changed_urls.insert(node->url());
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_URLS_STARRED,
         content::Source<Profile>(profile_),
         content::Details<history::URLsStarredDetails>(&details));
   }
   return node;
 }
 
 const BookmarkNode* BookmarkModel::GetNodeByID(const BookmarkNode* node,
-                                               int64 id) {
+                                               int64 id) const {
   if (node->id() == id)
     return node;
 
   for (int i = 0, child_count = node->child_count(); i < child_count; ++i) {
     const BookmarkNode* result = GetNodeByID(node->GetChild(i), id);
     if (result)
       return result;
   }
   return NULL;
 }
@@ skipping 120 matching lines @@
   file_changed_ = true;
 }
 
 BookmarkLoadDetails* BookmarkModel::CreateLoadDetails() {
   BookmarkNode* bb_node = CreatePermanentNode(BookmarkNode::BOOKMARK_BAR);
   BookmarkNode* other_node = CreatePermanentNode(BookmarkNode::OTHER_NODE);
   BookmarkNode* synced_node = CreatePermanentNode(BookmarkNode::SYNCED);
   return new BookmarkLoadDetails(bb_node, other_node, synced_node,
                                  new BookmarkIndex(profile_), next_node_id_);
 }