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

ipc/ipc_channel_proxy.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 "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 369 matching lines @@
 void ChannelProxy::RemoveFilter(MessageFilter* filter) {
   context_->ipc_message_loop()->PostTask(
       FROM_HERE, base::Bind(&Context::OnRemoveFilter, context_.get(),
                             make_scoped_refptr(filter)));
 }
 
 void ChannelProxy::ClearIPCMessageLoop() {
   context()->ClearIPCMessageLoop();
 }
 
-#if defined(OS_POSIX) && !defined(OS_NACL)
+#if defined(OS_POSIX)
 // See the TODO regarding lazy initialization of the channel in
 // ChannelProxy::Init().
 int ChannelProxy::GetClientFileDescriptor() {
   Channel* channel = context_.get()->channel_.get();
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->GetClientFileDescriptor();
 }
 
 int ChannelProxy::TakeClientFileDescriptor() {
   Channel* channel = context_.get()->channel_.get();
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->TakeClientFileDescriptor();
 }
 
 bool ChannelProxy::GetClientEuid(uid_t* client_euid) const {
   Channel* channel = context_.get()->channel_.get();
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->GetClientEuid(client_euid);
 }
 #endif
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC