Virtual destructors should have virtual keyword.

content/browser/renderer_host/clipboard_message_filter.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 CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "content/browser/browser_message_filter.h"
 #include "ui/base/clipboard/clipboard.h"
 
 class GURL;
 
 class ClipboardMessageFilter : public BrowserMessageFilter {
  public:
   ClipboardMessageFilter();
 
   virtual void OverrideThreadForMessage(const IPC::Message& message,
                                         BrowserThread::ID* thread);
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok);
  private:
-  ~ClipboardMessageFilter();
+  virtual ~ClipboardMessageFilter();
 
   void OnWriteObjectsAsync(const ui::Clipboard::ObjectMap& objects);
   void OnWriteObjectsSync(const ui::Clipboard::ObjectMap& objects,
                           base::SharedMemoryHandle bitmap_handle);
 
   void OnIsFormatAvailable(ui::Clipboard::FormatType format,
                            ui::Clipboard::Buffer buffer,
                            bool* result);
   void OnReadAvailableTypes(ui::Clipboard::Buffer buffer,
                             std::vector<string16>* types,
@@ skipping 14 matching lines @@
   // We have our own clipboard because we want to access the clipboard on the
   // IO thread instead of forwarding (possibly synchronous) messages to the UI
   // thread. This instance of the clipboard should be accessed only on the IO
   // thread.
   static ui::Clipboard* GetClipboard();
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardMessageFilter);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_CLIPBOARD_MESSAGE_FILTER_H_