Decouple IPC::MessageFilter from IPC::Channel

ppapi/proxy/plugin_message_filter.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 PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
 #define PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
@@ skipping 23 matching lines @@
   // outlive this class. It could be NULL if this filter is for a browser
   // channel.
   // |thread_registrar| is used to look up handling threads for resource
   // reply messages. It shouldn't be NULL.
   PluginMessageFilter(
       std::set<PP_Instance>* seen_instance_ids,
       scoped_refptr<ResourceReplyThreadRegistrar> thread_registrar);
   virtual ~PluginMessageFilter();
 
   // MessageFilter implementation.
-  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE;
   virtual void OnFilterRemoved() OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
   // Simulates an incoming resource reply that is handled on the calling thread.
   // For testing only.
   static void DispatchResourceReplyForTest(
       const ResourceMessageReplyParams& reply_params,
@@ skipping 10 matching lines @@
       const ResourceMessageReplyParams& reply_params,
       const IPC::Message& nested_msg);
 
   // All instance IDs ever queried by any renderer on this plugin. This is used
   // to make sure that new instance IDs are unique. This is a non-owning
   // pointer. It is managed by PluginDispatcher::PluginDelegate.
   std::set<PP_Instance>* seen_instance_ids_;
 
   scoped_refptr<ResourceReplyThreadRegistrar> resource_reply_thread_registrar_;
 
-  // The IPC channel to the renderer. May be NULL if we're not currently
+  // The IPC sender to the renderer. May be NULL if we're not currently
   // attached as a filter.
-  IPC::Channel* channel_;
+  IPC::Sender* sender_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_