Virtual destructors should have virtual keyword.

content/worker/worker_thread.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_WORKER_WORKER_THREAD_H_
 #define CONTENT_WORKER_WORKER_THREAD_H_
 #pragma once
 
 #include <set>
 
 #include "content/common/child_thread.h"
 
 class GURL;
 class AppCacheDispatcher;
 class DBMessageFilter;
 class WebDatabaseObserverImpl;
 class WebWorkerStubBase;
 class WorkerWebKitClientImpl;
 struct WorkerProcessMsg_CreateWorker_Params;
 
 class WorkerThread : public ChildThread {
  public:
   WorkerThread();
-  ~WorkerThread();
+  virtual ~WorkerThread();
 
   // Returns the one worker thread.
   static WorkerThread* current();
 
   // Invoked from stub constructors/destructors. Stubs own themselves.
   void AddWorkerStub(WebWorkerStubBase* stub);
   void RemoveWorkerStub(WebWorkerStubBase* stub);
 
   AppCacheDispatcher* appcache_dispatcher() {
     return appcache_dispatcher_.get();
@@ skipping 10 matching lines @@
   scoped_ptr<WebDatabaseObserverImpl> web_database_observer_impl_;
   scoped_refptr<DBMessageFilter> db_message_filter_;
 
   typedef std::set<WebWorkerStubBase*> WorkerStubsList;
   WorkerStubsList worker_stubs_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkerThread);
 };
 
 #endif  // CONTENT_WORKER_WORKER_THREAD_H_