Fix build warnings in NaCl IPC proxy.

ipc/ipc_channel_nacl.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 "ipc/ipc_channel_nacl.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <sys/nacl_imc_api.h>
 #include <sys/nacl_syscalls.h>
@@ skipping 365 matching lines @@
 base::ProcessId Channel::peer_pid() const {
   // This shouldn't actually get used in the untrusted side of the proxy, and we
   // don't have the real pid anyway.
   return -1;
 }
 
 bool Channel::Send(Message* message) {
   return channel_impl_->Send(message);
 }
 
-// static
-std::string Channel::GenerateVerifiedChannelID(const std::string& prefix) {
-  // A random name is sufficient validation on posix systems, so we don't need
-  // an additional shared secret.
-  std::string id = prefix;
-  if (!id.empty())
-    id.append(".");
-
-  return id.append(GenerateUniqueRandomChannelID());
-}
-
 }  // namespace IPC