Virtual destructors should have virtual keyword.

content/common/file_system/file_system_dispatcher.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_COMMON_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_
 #define CONTENT_COMMON_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 12 matching lines @@
 
 class FilePath;
 class GURL;
 
 // Dispatches and sends file system related messages sent to/from a child
 // process from/to the main browser process.  There is one instance
 // per child process.  Messages are dispatched on the main child thread.
 class FileSystemDispatcher : public IPC::Channel::Listener {
  public:
   FileSystemDispatcher();
-  ~FileSystemDispatcher();
+  virtual ~FileSystemDispatcher();
 
   // IPC::Channel::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   bool OpenFileSystem(const GURL& origin_url,
                       fileapi::FileSystemType type,
                       long long size,
                       bool create,
                       fileapi::FileSystemCallbackDispatcher* dispatcher);
   bool Move(const GURL& src_path,
@@ skipping 58 matching lines @@
   void OnDidOpenFile(
       int request_id,
       IPC::PlatformFileForTransit file);
 
   IDMap<fileapi::FileSystemCallbackDispatcher, IDMapOwnPointer> dispatchers_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemDispatcher);
 };
 
 #endif  // CONTENT_COMMON_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_H_