Revert 114539 - Move content::MakeSharedMemorySegmentViaIPC into its own file

content/common/child_process_sandbox_support_impl_shm_linux.cc

-// 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.
-
-#include "base/pickle.h"
-#include "content/common/child_process_sandbox_support_impl_linux.h"
-#include "content/common/sandbox_methods_linux.h"
-#include "content/common/unix_domain_socket_posix.h"
-
-namespace content {
-
-int MakeSharedMemorySegmentViaIPC(size_t length, bool executable) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_MAKE_SHARED_MEMORY_SEGMENT);
-  request.WriteUInt32(length);
-  request.WriteBool(executable);
-  uint8_t reply_buf[10];
-  int result_fd;
-  ssize_t result = UnixDomainSocket::SendRecvMsg(GetSandboxFD(),
-                                                 reply_buf, sizeof(reply_buf),
-                                                 &result_fd, request);
-  if (result == -1)
-    return -1;
-  return result_fd;
-}
-
-}  // namespace content