Make IPC::Channel polymorphic

content/common/gpu/gpu_channel.h

 // Copyright (c) 2012 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_COMMON_GPU_GPU_CHANNEL_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 58 matching lines @@
     return gpu_channel_manager_;
   }
 
   // Returns the name of the associated IPC channel.
   std::string GetChannelName();
 
 #if defined(OS_POSIX)
   int TakeRendererFileDescriptor();
 #endif  // defined(OS_POSIX)
 
-  base::ProcessId renderer_pid() const { return channel_->peer_pid(); }
+  base::ProcessId renderer_pid() const { return channel_->GetPeerPID(); }
 
   int client_id() const { return client_id_; }
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop() const {
     return io_message_loop_;
   }
 
   // IPC::Listener implementation:
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
   virtual void OnChannelError() OVERRIDE;
@@ skipping 134 matching lines @@
   scoped_ptr<DevToolsGpuAgent> devtools_gpu_agent_;
 
   size_t num_stubs_descheduled_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_