Virtual destructors should have virtual keyword.

chrome/browser/favicon/favicon_service.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_FAVICON_FAVICON_SERVICE_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_SERVICE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 76 matching lines @@
 
   // Sets the favicon for a page.
   void SetFavicon(const GURL& page_url,
                   const GURL& icon_url,
                   const std::vector<unsigned char>& image_data,
                   history::IconType icon_type);
 
  private:
   friend class base::RefCountedThreadSafe<FaviconService>;
 
-  ~FaviconService();
+  virtual ~FaviconService();
 
   Profile* profile_;
 
   // Helper to forward an empty result if we cannot get the history service.
   void ForwardEmptyResultAsync(GetFaviconRequest* request);
 
   DISALLOW_COPY_AND_ASSIGN(FaviconService);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_SERVICE_H_