Exclude host-side code from the NaCl IRT proxy build.

ppapi/proxy/ppb_file_system_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 "ppapi/proxy/ppb_file_system_proxy.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_system.h"
@@ skipping 117 matching lines @@
   dispatcher->Send(new PpapiHostMsg_PPBFileSystem_Create(
       API_ID_PPB_FILE_SYSTEM, instance, type, &result));
   if (result.is_null())
     return 0;
   return (new FileSystem(result, type))->GetReference();
 }
 
 bool PPB_FileSystem_Proxy::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_FileSystem_Proxy, msg)
+#if !defined(OS_NACL)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileSystem_Create, OnMsgCreate)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileSystem_Open, OnMsgOpen)
+#endif
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileSystem_OpenComplete, OnMsgOpenComplete)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+#if !defined(OS_NACL)
 void PPB_FileSystem_Proxy::OnMsgCreate(PP_Instance instance,
                                        int type,
                                        HostResource* result) {
   thunk::EnterResourceCreation enter(instance);
   if (enter.failed())
     return;
   PP_Resource resource = enter.functions()->CreateFileSystem(
       instance, static_cast<PP_FileSystemType>(type));
   if (!resource)
     return;  // CreateInfo default constructor initializes to 0.
   result->SetHostResource(instance, resource);
 }
 
 void PPB_FileSystem_Proxy::OnMsgOpen(const HostResource& host_resource,
                                      int64_t expected_size) {
   EnterHostFromHostResourceForceCallback<PPB_FileSystem_API> enter(
       host_resource, callback_factory_,
       &PPB_FileSystem_Proxy::OpenCompleteInHost, host_resource);
   if (enter.succeeded())
     enter.SetResult(enter.object()->Open(expected_size, enter.callback()));
 }
+#endif  // !defined(OS_NACL)
 
 // Called in the plugin to handle the open callback.
 void PPB_FileSystem_Proxy::OnMsgOpenComplete(const HostResource& host_resource,
                                              int32_t result) {
   EnterPluginFromHostResource<PPB_FileSystem_API> enter(host_resource);
   if (enter.succeeded())
     static_cast<FileSystem*>(enter.object())->OpenComplete(result);
 }
 
+#if !defined(OS_NACL)
 void PPB_FileSystem_Proxy::OpenCompleteInHost(
     int32_t result,
     const HostResource& host_resource) {
   dispatcher()->Send(new PpapiMsg_PPBFileSystem_OpenComplete(
       API_ID_PPB_FILE_SYSTEM, host_resource, result));
 }
+#endif  // !defined(OS_NACL)
 
 }  // namespace proxy
 }  // namespace ppapi