Virtual destructors should have virtual keyword.

content/browser/worker_host/worker_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_WORKER_HOST_WORKER_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_WORKER_HOST_WORKER_MESSAGE_FILTER_H_
 
 #include "base/callback_old.h"
 #include "content/browser/browser_message_filter.h"
 
@@ skipping 23 matching lines @@
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok);
 
   int GetNextRoutingID();
   int render_process_id() const { return render_process_id_; }
   ResourceDispatcherHost* resource_dispatcher_host() const {
     return resource_dispatcher_host_;
   }
 
  private:
-  ~WorkerMessageFilter();
+  virtual ~WorkerMessageFilter();
 
   // Message handlers.
   void OnCreateWorker(const ViewHostMsg_CreateWorker_Params& params,
                       int* route_id);
   void OnLookupSharedWorker(const ViewHostMsg_CreateWorker_Params& params,
                            bool* exists,
                            int* route_id,
                            bool* url_error);
   void OnCancelCreateDedicatedWorker(int route_id);
   void OnForwardToWorker(const IPC::Message& message);
   void OnDocumentDetached(unsigned long long document_id);
   void OnCreateMessagePort(int* route_id, int* message_port_id);
 
   int render_process_id_;
   const content::ResourceContext* const resource_context_;
   ResourceDispatcherHost* resource_dispatcher_host_;
 
   // This is guaranteed to be valid until OnChannelClosing is closed, and it's
   // not used after.
   scoped_ptr<CallbackWithReturnValue<int>::Type> next_routing_id_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WorkerMessageFilter);
 };
 
 #endif  // CONTENT_BROWSER_WORKER_HOST_WORKER_MESSAGE_FILTER_H_