Virtual destructors should have virtual keyword.

content/gpu/gpu_child_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_GPU_GPU_CHILD_THREAD_H_
 #define CONTENT_GPU_GPU_CHILD_THREAD_H_
 #pragma once
 
 #include <string>
 
@@ skipping 29 matching lines @@
  public:
 #if defined(OS_WIN)
   explicit GpuChildThread(sandbox::TargetServices* target_services);
 #else
   GpuChildThread();
 #endif
 
   // For single-process mode.
   explicit GpuChildThread(const std::string& channel_id);
 
-  ~GpuChildThread();
+  virtual ~GpuChildThread();
 
   void Init(const base::Time& process_start_time);
   void StopWatchdog();
 
   // ChildThread overrides.
   virtual bool Send(IPC::Message* msg);
   virtual bool OnControlMessageReceived(const IPC::Message& msg);
 
  private:
   // Message handlers.
@@ skipping 21 matching lines @@
 
   scoped_ptr<GpuChannelManager> gpu_channel_manager_;
 
   // Information about the GPU, such as device and vendor ID.
   GPUInfo gpu_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };
 
 #endif  // CONTENT_GPU_GPU_CHILD_THREAD_H_