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

sandbox/win/src/sandbox_policy_base.cc

 // Copyright (c) 2012 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 "sandbox/win/src/sandbox_policy_base.h"
 
 #include <sddl.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 457 matching lines @@
                                        PRIMARY, lockdown);
   if (ERROR_SUCCESS != result)
     return SBOX_ERROR_GENERIC;
 
   // If we're launching on the alternate desktop we need to make sure the
   // integrity label on the object is no higher than the sandboxed process's
   // integrity level. So, we lower the label on the desktop process if it's
   // not already low enough for our process.
   if (alternate_desktop_handle_ && use_alternate_desktop_ &&
       integrity_level_ != INTEGRITY_LEVEL_LAST &&
-      alternate_desktop_integrity_level_label_ < integrity_level_ &&
-      base::win::OSInfo::GetInstance()->version() >= base::win::VERSION_VISTA) {
+      alternate_desktop_integrity_level_label_ < integrity_level_) {
     // Integrity label enum is reversed (higher level is a lower value).
     static_assert(INTEGRITY_LEVEL_SYSTEM < INTEGRITY_LEVEL_UNTRUSTED,
                   "Integrity level ordering reversed.");
     result = SetObjectIntegrityLabel(alternate_desktop_handle_,
                                      SE_WINDOW_OBJECT,
                                      L"",
                                      GetIntegrityLevelString(integrity_level_));
     if (ERROR_SUCCESS != result)
       return SBOX_ERROR_GENERIC;
 
@@ skipping 272 matching lines @@
       break;
     }
 
     default: { return SBOX_ERROR_UNSUPPORTED; }
   }
 
   return SBOX_ALL_OK;
 }
 
 }  // namespace sandbox