Don't make classes derive from ChildProcessHost, and instead have them use it through composition...

content/browser/ppapi_plugin_process_host.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_PPAPI_PLUGIN_PROCESS_HOST_H_
 #define CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_
 #pragma once
 
 #include <queue>
 
@@ skipping 64 matching lines @@
   // You must call Init before doing anything else.
   PpapiPluginProcessHost(net::HostResolver* host_resolver);
   PpapiPluginProcessHost();
 
   // Actually launches the process with the given plugin info. Returns true
   // on success (the process was spawned).
   bool Init(const content::PepperPluginInfo& info);
 
   void RequestPluginChannel(Client* client);
 
-  virtual bool CanShutdown() OVERRIDE;
   virtual void OnProcessLaunched() OVERRIDE;
 
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
   virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
   virtual void OnChannelError() OVERRIDE;
 
   void CancelRequests();
 
   // IPC message handlers.
   void OnRendererPluginChannelCreated(const IPC::ChannelHandle& handle);
@@ skipping 18 matching lines @@
   const bool is_broker_;
 
   // The unique id created for the process.
   int process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiPluginProcessHost);
 };
 
 #endif  // CONTENT_BROWSER_PPAPI_PLUGIN_PROCESS_HOST_H_