Make ChildProcessHost be used through an interface in content/public, instead of by inheritence.

content/browser/browser_child_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_BROWSER_CHILD_PROCESS_HOST_H_
 #define CONTENT_BROWSER_BROWSER_CHILD_PROCESS_HOST_H_
 #pragma once
 
 #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/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;
 }
 
+namespace content {
+class ChildProcessHost;
+}
+
 // Plugins/workers and other child processes that live on the IO thread should
 // derive from this class.
 //
 // [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 content::ChildProcessHostDelegate,
     public ChildProcessLauncher::Client,
     public base::WaitableEventWatcher::Delegate,
     public IPC::Message::Sender {
@@ skipping 83 matching lines @@
   // 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);
 
   // Sends the given notification on the UI thread.
   void Notify(int type);
 
-  ChildProcessHost* child_process_host() const {
+  content::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; }
 
  private:
   // By using an internal class as the ChildProcessLauncher::Client, we can
   // intercept OnProcessLaunched and do our own processing before
   // calling the subclass' implementation.
   class ClientHook : public ChildProcessLauncher::Client {
    public:
     explicit ClientHook(BrowserChildProcessHost* host);
     virtual void OnProcessLaunched() OVERRIDE;
    private:
     BrowserChildProcessHost* host_;
   };
 
   content::ChildProcessData data_;
-  scoped_ptr<ChildProcessHost> child_process_host_;
+  scoped_ptr<content::ChildProcessHost> child_process_host_;
 
   ClientHook client_;
   scoped_ptr<ChildProcessLauncher> child_process_;
 #if defined(OS_WIN)
   base::WaitableEventWatcher child_watcher_;
 #else
   base::WeakPtrFactory<BrowserChildProcessHost> task_factory_;
 #endif
   bool disconnect_was_alive_;
 };
 
 #endif  // CONTENT_BROWSER_BROWSER_CHILD_PROCESS_HOST_H_