Revert 129627 - Add a sandbox API for broker handle duplication

sandbox/src/ipc_tags.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2008 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.
 
 #ifndef SANDBOX_SRC_IPC_TAGS_H__
 #define SANDBOX_SRC_IPC_TAGS_H__
 
 namespace sandbox {
 
 enum {
   IPC_UNUSED_TAG = 0,
   IPC_PING1_TAG,  // Takes a cookie in parameters and returns the cookie
                   // multiplied by 2 and the tick_count. Used for testing only.
   IPC_PING2_TAG,  // Takes an in/out cookie in parameters and modify the cookie
                   // to be multiplied by 3. Used for testing only.
   IPC_NTCREATEFILE_TAG,
   IPC_NTOPENFILE_TAG,
   IPC_NTQUERYATTRIBUTESFILE_TAG,
   IPC_NTQUERYFULLATTRIBUTESFILE_TAG,
   IPC_NTSETINFO_RENAME_TAG,
   IPC_CREATENAMEDPIPEW_TAG,
   IPC_NTOPENTHREAD_TAG,
   IPC_NTOPENPROCESS_TAG,
   IPC_NTOPENPROCESSTOKEN_TAG,
   IPC_NTOPENPROCESSTOKENEX_TAG,
   IPC_CREATEPROCESSW_TAG,
   IPC_CREATEEVENT_TAG,
   IPC_OPENEVENT_TAG,
   IPC_NTCREATEKEY_TAG,
   IPC_NTOPENKEY_TAG,
-  IPC_DUPLICATEHANDLEPROXY_TAG,
   IPC_LAST_TAG
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_IPC_TAGS_H__