Revert 90805 - I am submitting this with LGTMs from agl@ and evanm@. I'm marking this as TBR=jam@...

chrome/common/nacl_helper_linux.h

-// Copyright (c) 2011 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 CHROME_COMMON_NACL_HELPER_LINUX_H_
-#define CHROME_COMMON_NACL_HELPER_LINUX_H_
-#pragma once
-
-// A mini-zygote specifically for Native Client. This file defines
-// constants used to implement communication between the nacl_helper
-// process and the Chrome zygote.
-
-// Used by Helper to tell Zygote it has started successfully.
-#define kNaClHelperStartupAck "NACLHELPER_OK"
-// Used by Zygote to ask Helper to fork a new NaCl loader.
-#define kNaClForkRequest "NACLFORK"
-
-// The next set of constants define global Linux file descriptors.
-// For communications between NaCl loader and browser.
-// See also content/common/zygote_main_linux.cc and
-// http://code.google.com/p/chromium/wiki/LinuxZygote
-#define kNaClBrowserDescriptor 3
-// For communications between NaCl loader and zygote.
-// We put the kNaClZygoteDescriptor on 3 together with the
-// kNaClBrowserDescriptor. They are never used at the same
-// time, and this prevents /dev/urandom from using the fd.
-#define kNaClZygoteDescriptor 3
-// For communications between the NaCl loader process and
-// the SUID sandbox.
-#define kNaClSandboxDescriptor 5
-// NOTE: kNaClBrowserDescriptor and kNaClSandboxDescriptor must match
-// content/browser/zygote_main_linux.cc kBrowserDescriptor and
-// kMagicSandboxIPCDescriptor.
-
-// A fork request from the Zygote to the helper includes an array
-// of three file descriptors. These constants are used as indicies
-// into the array.
-// Used to pass in the descriptor for talking to the Browser
-#define kNaClBrowserFDIndex 0
-// The next two are used in the protocol for discovering the
-// child processes real PID from within the SUID sandbox. See
-// http://code.google.com/p/chromium/wiki/LinuxZygote
-#define kNaClDummyFDIndex 1
-#define kNaClParentFDIndex 2
-
-#endif  // CHROME_COMMON_NACL_HELPER_LINUX_H_