Make IPC::Channel polymorphic

content/child/npapi/np_channel_base.h

 // Copyright 2013 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_CHILD_NPAPI_NP_CHANNEL_BASE_H_
 #define CONTENT_CHILD_NPAPI_NP_CHANNEL_BASE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 68 matching lines @@
   void RemoveMappingForNPObjectOwner(int route_id);
 
   NPObject* GetExistingNPObjectProxy(int route_id);
   int GetExistingRouteForNPObjectStub(NPObject* npobject);
   struct _NPP* GetExistingNPObjectOwner(int route_id);
   int GetExistingRouteForNPObjectOwner(struct _NPP* owner);
 
   // IPC::Sender implementation:
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
-  base::ProcessId peer_pid() { return channel_->peer_pid(); }
+  base::ProcessId peer_pid() { return channel_->GetPeerPID(); }
   IPC::ChannelHandle channel_handle() const { return channel_handle_; }
 
   // Returns the number of open NPObject channels in this process.
   static int Count();
 
   // Returns a new route id.
   virtual int GenerateRouteID() = 0;
 
   // Returns whether the channel is valid or not. A channel is invalid
   // if it is disconnected due to a channel error.
@@ skipping 115 matching lines @@
   // have the unblock flag set, since they could be followed by a sync message
   // that won't get dispatched until the call to the renderer is complete.
   bool send_unblocking_only_during_unblock_dispatch_;
 
   DISALLOW_COPY_AND_ASSIGN(NPChannelBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_NPAPI_NP_CHANNEL_BASE_H_