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

sandbox/win/BUILD.gn

 # Copyright 2014 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.
 
 import("//testing/test.gni")
 
 # This needs to be a static library rather than a sources set because small
 # portions of this are used in some contexts (like chrome_elf), and it
 # doesnn't seem to dead-code strip very well. This saves 12K on chrome_elf.dll,
 # over a source set, for example.
@@ skipping 123 matching lines @@
     "src/win2k_threadpool.cc",
     "src/win2k_threadpool.h",
     "src/win_utils.cc",
     "src/win_utils.h",
     "src/window.cc",
     "src/window.h",
   ]
 
   if (current_cpu == "x64") {
     sources += [
-      "src/Wow64_64.cc",
       "src/interceptors_64.cc",
       "src/interceptors_64.h",
       "src/resolver_64.cc",
       "src/service_resolver_64.cc",
     ]
   } else if (current_cpu == "x86") {
     sources += [
-      "src/Wow64.cc",
-      "src/Wow64.h",
       "src/resolver_32.cc",
       "src/service_resolver_32.cc",
       "src/sidestep/ia32_modrm_map.cpp",
       "src/sidestep/ia32_opcode_map.cpp",
       "src/sidestep/mini_disassembler.cpp",
       "src/sidestep/mini_disassembler.h",
       "src/sidestep/mini_disassembler_types.h",
       "src/sidestep/preamble_patcher.h",
       "src/sidestep/preamble_patcher_with_stub.cpp",
       "src/sidestep_resolver.cc",
@@ skipping 141 matching lines @@
     "sandbox_poc/pocdll/spyware.cc",
     "sandbox_poc/pocdll/utils.h",
   ]
 
   defines = [ "POCDLL_EXPORTS" ]
 
   deps = [
     "//build/config/sanitizers:deps",
   ]
 }