Add ipc_channel_nacl to the untrusted build and fix all compile/link errors.

ipc/ipc_channel_nacl.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 IPC_IPC_CHANNEL_NACL_H_
 #define IPC_IPC_CHANNEL_NACL_H_
 #pragma once
 
 #include "ipc/ipc_channel.h"
+#include "ipc/ipc_channel_reader.h"
 
 namespace IPC {
 
 // Similar to the Posix version of ChannelImpl but for Native Client code.
 // This is somewhat different because NaCl's send/recvmsg is slightly different
 // and we don't need to worry about complicated set up and READWRITE mode for
 // sharing handles.
 class Channel::ChannelImpl : public internal::ChannelReader {
  public:
   ChannelImpl(const IPC::ChannelHandle& channel_handle,
               Mode mode,
               Listener* listener);
   virtual ~ChannelImpl();
 
   // Channel implementation.
   bool Connect();
   void Close();
   bool Send(Message* message);
   int GetClientFileDescriptor() const;
   int TakeClientFileDescriptor();
   bool AcceptsConnections() const;
   bool HasAcceptedConnection() const;
   bool GetClientEuid(uid_t* client_euid) const;
   void ResetToAcceptingConnectionState();
   static bool IsNamedServerInitialized(const std::string& channel_id);
 
+  virtual ReadState ReadData(char* buffer,
+                             int buffer_len,
+                             int* bytes_read) OVERRIDE;
+  virtual bool WillDispatchInputMessage(Message* msg) OVERRIDE;
+  virtual bool DidEmptyInputBuffers() OVERRIDE;
+  virtual void HandleHelloMessage(const Message& msg) OVERRIDE;
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelImpl);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_NACL_H_