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

content/browser/browser_child_process_host.h

Index: content/browser/browser_child_process_host.h
===================================================================
--- content/browser/browser_child_process_host.h	(revision 112722)
+++ content/browser/browser_child_process_host.h	(working copy)
@@ -8,14 +8,18 @@
 
 #include <list>
 
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process.h"
 #include "base/synchronization/waitable_event_watcher.h"
 #include "content/browser/child_process_launcher.h"
-#include "content/common/child_process_host.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/child_process_data.h"
+#include "content/public/common/child_process_host_delegate.h"
+#include "ipc/ipc_message.h"
 
+class ChildProcessHost;
+
 namespace base {
 class WaitableEvent;
 }
@@ -26,9 +30,10 @@
 // [Browser]RenderProcessHost is the main exception that doesn't derive from
 // this class. That project lives on the UI thread.
 class CONTENT_EXPORT BrowserChildProcessHost :
-    public ChildProcessHost,
+    public content::ChildProcessHostDelegate,
     public ChildProcessLauncher::Client,
-    public base::WaitableEventWatcher::Delegate {
+    public base::WaitableEventWatcher::Delegate,
+    public IPC::Message::Sender {
  public:
   virtual ~BrowserChildProcessHost();
 
@@ -58,6 +63,9 @@
     std::list<BrowserChildProcessHost*>::iterator iterator_;
   };
 
+  // IPC::Message::Sender override
+  virtual bool Send(IPC::Message* message) OVERRIDE;
+
   const content::ChildProcessData& data() const { return data_; }
   content::ProcessType type() const { return data_.type; }
   const string16& name() const { return data_.name; }
@@ -102,14 +110,16 @@
   // GetExitCodeProcess()).  |exit_code| may be NULL.
   virtual base::TerminationStatus GetChildTerminationStatus(int* exit_code);
 
-  // Overrides from ChildProcessHost
-  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
+  // ChildProcessHostDelegate implementation:
+  virtual bool CanShutdown() OVERRIDE;
   virtual void OnChildDisconnected() OVERRIDE;
   virtual void ShutdownStarted() OVERRIDE;
-  // Extends the base class implementation and removes this host from
-  // the host list. Calls ChildProcessHost::ForceShutdown
-  virtual void ForceShutdown() OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnChannelConnected(int32 peer_pid) OVERRIDE;
 
+  // Removes this host from the host list. Calls ChildProcessHost::ForceShutdown
+  void ForceShutdown();
+
   // Controls whether the child process should be terminated on browser
   // shutdown. Default is to always terminate.
   void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
@@ -117,6 +127,9 @@
   // Sends the given notification on the UI thread.
   void Notify(int type);
 
+  ChildProcessHost* child_process_host() const {
+    return child_process_host_.get();
+  }
   void set_name(const string16& name) { data_.name = name; }
   void set_handle(base::ProcessHandle handle) { data_.handle = handle; }
 
@@ -133,6 +146,7 @@
   };
 
   content::ChildProcessData data_;
+  scoped_ptr<ChildProcessHost> child_process_host_;
 
   ClientHook client_;
   scoped_ptr<ChildProcessLauncher> child_process_;