Virtual destructors should have virtual keyword.

content/browser/gpu/gpu_process_host_ui_shim.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_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
 #pragma once
 
 // This class lives on the UI thread and supports classes like the
 // BackingStoreProxy, which must live on the UI thread. The IO thread
@@ skipping 22 matching lines @@
 
 namespace IPC {
 struct ChannelHandle;
 class Message;
 }
 
 // A task that will forward an IPC message to the UI shim.
 class RouteToGpuProcessHostUIShimTask : public Task {
  public:
   RouteToGpuProcessHostUIShimTask(int host_id, const IPC::Message& msg);
-  ~RouteToGpuProcessHostUIShimTask();
+  virtual ~RouteToGpuProcessHostUIShimTask();
 
  private:
   virtual void Run();
 
   int host_id_;
   IPC::Message msg_;
 };
 
 class GpuProcessHostUIShim
     : public IPC::Channel::Listener,
@@ skipping 60 matching lines @@
   // GpuChannelManager or null otherwise. It must be called and deleted on the
   // GPU thread.
   GpuChannelManager* gpu_channel_manager_;
 
   // This is likewise single process / in process GPU specific. This is a Sender
   // implementation that forwards IPC messages to this UI shim on the UI thread.
   IPC::Channel::Sender* ui_thread_sender_;
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_