Virtual destructors should have virtual keyword.

chrome/browser/bookmarks/bookmark_storage.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_STORAGE_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_
 #pragma once
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
@@ skipping 86 matching lines @@
   // Notification the bookmark bar model is going to be deleted. If there is
   // a pending save, it is saved immediately.
   void BookmarkModelDeleted();
 
   // ImportantFileWriter::DataSerializer
   virtual bool SerializeData(std::string* output);
 
  private:
   friend class base::RefCountedThreadSafe<BookmarkStorage>;
 
-  ~BookmarkStorage();
+  virtual ~BookmarkStorage();
 
   class LoadTask;
 
   // Callback from backend with the results of the bookmark file.
   // This may be called multiple times, with different paths. This happens when
   // we migrate bookmark data from database.
   void OnLoadFinished(bool file_exists,
                       const FilePath& path);
 
   // Loads bookmark data from |file| and notifies the model when finished.
@@ skipping 34 matching lines @@
   // Path to temporary file created during migrating bookmarks from history.
   const FilePath tmp_history_path_;
 
   // See class description of BookmarkLoadDetails for details on this.
   scoped_ptr<BookmarkLoadDetails> details_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkStorage);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_