Virtual destructors should have virtual keyword.

content/common/gpu/gpu_channel_manager.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_GPU_GPU_CHANNEL_MANAGER_H_
 #define CONTENT_GPU_GPU_CHANNEL_MANAGER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 29 matching lines @@
 // a pointer to IPC::Message::Sender, which can be implemented by other hosts
 // to send IPC messages to the browser process IO thread on the
 // GpuChannelManager's behalf.
 class GpuChannelManager : public IPC::Channel::Listener,
                           public IPC::Message::Sender {
  public:
   GpuChannelManager(IPC::Message::Sender* browser_channel,
                     GpuWatchdog* watchdog,
                     base::MessageLoopProxy* io_message_loop,
                     base::WaitableEvent* shutdown_event);
-  ~GpuChannelManager();
+  virtual ~GpuChannelManager();
 
   // Remove the channel for a particular renderer.
   void RemoveChannel(int renderer_id);
 
   // Listener overrides.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   // Sender overrides.
   virtual bool Send(IPC::Message* msg);
 
@@ skipping 34 matching lines @@
   // one channel for each renderer process that has connected to this GPU
   // process.
   typedef base::hash_map<int, scoped_refptr<GpuChannel> > GpuChannelMap;
   GpuChannelMap gpu_channels_;
   GpuWatchdog* watchdog_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelManager);
 };
 
 #endif  // CONTENT_GPU_GPU_CHANNEL_MANAGER_H_