Virtual destructors should have virtual keyword.

chrome/browser/net/net_log_logger.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 CHROME_BROWSER_NET_NET_LOG_LOGGER_H_
 #define CHROME_BROWSER_NET_NET_LOG_LOGGER_H_
 #pragma once
 
 #include "base/memory/scoped_handle.h"
 #include "chrome/browser/net/chrome_net_log.h"
 
 class FilePath;
 
 // NetLogLogger watches the NetLog event stream, and sends all entries to
 // VLOG(1) or a path specified on creation.  This is to debug errors that
 // prevent getting to the about:net-internals page.
 //
 // Relies on ChromeNetLog only calling an Observer once at a time for
 // thread-safety.
 class NetLogLogger : public ChromeNetLog::ThreadSafeObserver {
  public:
   // If |log_path| is empty or file creation fails, writes to VLOG(1).
   // Otherwise, writes to |log_path|.  Uses one line per entry, for
   // easy parsing.
   explicit NetLogLogger(const FilePath &log_path);
-  ~NetLogLogger();
+  virtual ~NetLogLogger();
 
   // ThreadSafeObserver implementation:
   virtual void OnAddEntry(net::NetLog::EventType type,
                           const base::TimeTicks& time,
                           const net::NetLog::Source& source,
                           net::NetLog::EventPhase phase,
                           net::NetLog::EventParameters* params) OVERRIDE;
 
  private:
   ScopedStdioHandle file_;
 
   DISALLOW_COPY_AND_ASSIGN(NetLogLogger);
 };
 
 #endif  // CHROME_BROWSER_NET_NET_LOG_LOGGER_H_
-