Fix dup and dup2 in nacl-mounts

libraries/nacl-mounts/base/KernelProxy.h

 /*
  * Copyright (c) 2012 The Native Client 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 PACKAGES_LIBRARIES_NACL_MOUNTS_BASE_KERNELPROXY_H_
 #define PACKAGES_LIBRARIES_NACL_MOUNTS_BASE_KERNELPROXY_H_
 
 #include <errno.h>
 #include <string.h>
@@ skipping 140 matching lines @@
   struct FileHandle {
     Mount *mount;
     Socket* stream;
     ino_t node;
     off_t offset;
     int flags;
     int use_count;
     pthread_mutex_t lock;
   };
   FileHandle* GetFileHandle(int fd);
+  int Close(int fd);
 
   BaseSocketSubSystem* socket_subsystem_;
   Path cwd_;
   int max_path_len_;
   MountManager mm_;
   pthread_mutex_t kp_lock_;
   static KernelProxy *kp_instance_;
 
   SlotAllocator<FileDescriptor> fds_;
   SlotAllocator<FileHandle> open_files_;
 
   int OpenHandle(Mount *mount, const std::string& path, int oflag, mode_t mode);
 
   KernelProxy();
   static void Instantiate();
 };
 
 #endif  // PACKAGES_LIBRARIES_NACL_MOUNTS_BASE_KERNELPROXY_H_