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

chrome/browser/bookmarks/bookmark_model.h

 // 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.
 
 #ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 #pragma once
 
 #include <set>
 #include <vector>
@@ skipping 278 matching lines @@
   // Returns all the bookmarked urls.
   // This method is thread safe.
   // See BookmarkService for more details on this.
   virtual void GetBookmarks(std::vector<GURL>* urls) OVERRIDE;
 
   // Blocks until loaded; this is NOT invoked on the main thread.
   // See BookmarkService for more details on this.
   virtual void BlockTillLoaded() OVERRIDE;
 
   // Returns the node with |id|, or NULL if there is no node with |id|.
-  const BookmarkNode* GetNodeByID(int64 id);
+  const BookmarkNode* GetNodeByID(int64 id) const;
 
   // Adds a new folder node at the specified position.
   const BookmarkNode* AddFolder(const BookmarkNode* parent,
                                 int index,
                                 const string16& title);
 
   // Adds a url at the specified position.
   const BookmarkNode* AddURL(const BookmarkNode* parent,
                              int index,
                              const string16& title,
@@ skipping 76 matching lines @@
 
   // Adds the node at the specified position and sends notification. If
   // was_bookmarked is true, it indicates a bookmark already existed for the
   // URL.
   BookmarkNode* AddNode(BookmarkNode* parent,
                         int index,
                         BookmarkNode* node,
                         bool was_bookmarked);
 
   // Implementation of GetNodeByID.
-  const BookmarkNode* GetNodeByID(const BookmarkNode* node, int64 id);
+  const BookmarkNode* GetNodeByID(const BookmarkNode* node, int64 id) const;
 
   // Returns true if the parent and index are valid.
   bool IsValidIndex(const BookmarkNode* parent, int index, bool allow_end);
 
   // Creates one of the possible permanent nodes (bookmark bar node, other node
   // and synced node) from |type|.
   BookmarkNode* CreatePermanentNode(BookmarkNode::Type type);
 
   // Notification that a favicon has finished loading. If we can decode the
   // favicon, FaviconLoaded is invoked.
@@ skipping 72 matching lines @@
   scoped_ptr<BookmarkIndex> index_;
 
   base::WaitableEvent loaded_signal_;
 
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_