Virtual destructors should have virtual keyword.

content/browser/resolve_proxy_msg_helper.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_RESOLVE_PROXY_MSG_HELPER_H_
 #define CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 15 matching lines @@
 //
 // This object is expected to live on the IO thread.
 class ResolveProxyMsgHelper : public BrowserMessageFilter {
  public:
   // If |proxy_service| is NULL, then the main profile's proxy service will
   // be used.
   explicit ResolveProxyMsgHelper(net::ProxyService* proxy_service);
 
   // Destruction cancels the current outstanding request, and clears the
   // pending queue.
-  ~ResolveProxyMsgHelper();
+  virtual ~ResolveProxyMsgHelper();
 
   // BrowserMessageFilter implementation
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok);
 
   void OnResolveProxy(const GURL& url, IPC::Message* reply_msg);
 
  private:
   // Callback for the ProxyService (bound to |callback_|).
   void OnResolveProxyCompleted(int result);
@@ skipping 29 matching lines @@
   // FIFO queue of pending requests. The first entry is always the current one.
   typedef std::deque<PendingRequest> PendingRequestList;
   PendingRequestList pending_requests_;
 
   // Specified by unit-tests, to use this proxy service in place of the
   // global one.
   net::ProxyService* proxy_service_override_;
 };
 
 #endif  // CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_