Cleanup/Remove Windows XP/Vista version checks from Windows sandbox code

sandbox/win/src/Wow64.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 SANDBOX_SRC_WOW64_H__
-#define SANDBOX_SRC_WOW64_H__
-
-#include <windows.h>
-
-#include "base/macros.h"
-#include "base/win/scoped_handle.h"
-#include "sandbox/win/src/sandbox_types.h"
-
-namespace sandbox {
-
-class TargetProcess;
-
-// This class wraps the code needed to interact with the Windows On Windows
-// subsystem on 64 bit OSes, from the point of view of interceptions.
-class Wow64 {
- public:
-  Wow64(TargetProcess* child, HMODULE ntdll);
-  ~Wow64();
-
-  // Waits for the 32 bit DLL to get loaded on the child process. This function
-  // will return immediately if not running under WOW, or launch the helper
-  // process and wait until ntdll is ready.
-  bool WaitForNtdll();
-
- private:
-  // Runs the WOW helper process, passing the address of a buffer allocated on
-  // the child (one page).
-  bool RunWowHelper(void* buffer);
-
-  // This method receives "notifications" whenever a DLL is mapped on the child.
-  bool DllMapped();
-
-  // Returns true if ntdll.dll is mapped on the child.
-  bool NtdllPresent();
-
-  TargetProcess* child_;  // Child process.
-  HMODULE ntdll_;         // ntdll on the parent.
-  // Event that is signaled on dll load.
-  base::win::ScopedHandle dll_load_;
-  // Event to signal to continue execution on the child.
-  base::win::ScopedHandle continue_load_;
-  DISALLOW_IMPLICIT_CONSTRUCTORS(Wow64);
-};
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_SRC_WOW64_H__