Revert of Remove sandbox/win/tools. (patchset #1 id:1 of https://codereview.chromium.org/2773333002/ )

Reason for revert:
Compile failed on WinClang64.

https://uberchromegw.corp.google.com/i/chromium.win/builders/WinClang64%20%28dbg%29/builds/11236

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.win%2FWinClang64__dbg_%2F11236%2F%2B%2Frecipes%2Fsteps%2Fcompile%2F0%2Fstdout

[479/12131] CXX obj/sandbox/win/pocdll/handles.obj
FAILED: obj/sandbox/win/pocdll/handles.obj
C:\b\c\goma_client/gomacc.exe ../../third_party/llvm-build/Release+Asserts/bin/clang-cl.exe /nologo /showIncludes /FC @obj/sandbox/win/pocdll/handles.obj.rsp /c ../../sandbox/win/sandbox_poc/pocdll/handles.cc /Foobj/sandbox/win/pocdll/handles.obj /Fd"obj/sandbox/win/pocdll_cc.pdb"
C:\b\c\b\win_clang\src\sandbox\win\sandbox_poc\pocdll\handles.cc(7,10):  fatal error: 'sandbox/win/tools/finder/ntundoc.h' file not found
#include "sandbox/win/tools/finder/ntundoc.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

Original issue's description:
> Remove sandbox/win/tools.
>
> The files therein look unused, haven't been really touched since 2012, aren't
> referenced in any build files, and have some maintenance cost.
>
> BUG=661774
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.win:win10_chromium_x64_rel_ng
>
> Review-Url: https://codereview.chromium.org/2773333002
> Cr-Commit-Position: refs/heads/master@{#459696}
> Committed: https://chromium.googlesource.com/chromium/src/+/6625b2f764ae4efb0637215660500ba721b8a43d

TBR=wfh@chromium.org,thakis@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=661774

Review-Url: https://codereview.chromium.org/2775123002
Cr-Original-Commit-Position: refs/heads/master@{#459698}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 843ecf04f4af01faed28fdbb92db683944a06918
10 files changed
tree: d747d81d765f37085468f226d0e04d916e3824c1
  1. linux/
  2. mac/
  3. win/
  4. BUILD.gn
  5. features.gni
  6. OWNERS
  7. sandbox_export.h