Remove some unused NaCl srpc methods (AttachService, ctor variant)

components/nacl/renderer/plugin/srpc_client.cc

 /*
  * 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.
  */
 
 #include "components/nacl/renderer/plugin/srpc_client.h"
 
 #include <string.h>
 
@@ skipping 173 matching lines @@
   if (NACL_SRPC_RESULT_OK != last_error_) {
     PLUGIN_PRINTF(("SrpcClient::Invoke (err='%s', return 0)\n",
                    NaClSrpcErrorString(last_error_)));
     return false;
   }
 
   PLUGIN_PRINTF(("SrpcClient::Invoke (return 1)\n"));
   return true;
 }
 
-void SrpcClient::AttachService(NaClSrpcService* service, void* instance_data) {
-  srpc_channel_.server = service;
-  srpc_channel_.server_instance_data = instance_data;
-}
-
 }  // namespace plugin