Remove sandbox on Windows.

sandbox/win/src/win2k_threadpool.h

-// 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.
-
-#ifndef SANDBOX_SRC_WIN2K_THREADPOOL_H_
-#define SANDBOX_SRC_WIN2K_THREADPOOL_H_
-
-#include <stddef.h>
-
-#include <algorithm>
-#include <list>
-#include "base/macros.h"
-#include "sandbox/win/src/crosscall_server.h"
-
-namespace sandbox {
-
-// Win2kThreadPool a simple implementation of a thread provider as required
-// for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details
-// and requirements of this interface.
-//
-// Implementing the thread provider as a thread pool is desirable in the case
-// of shared memory IPC because it can generate a large number of waitable
-// events: as many as channels. A thread pool does not create a thread per
-// event, instead maintains a few idle threads but can create more if the need
-// arises.
-//
-// This implementation simply thunks to the nice thread pool API of win2k.
-class Win2kThreadPool : public ThreadProvider {
- public:
-  Win2kThreadPool();
-  ~Win2kThreadPool() override;
-
-  bool RegisterWait(const void* cookie,
-                    HANDLE waitable_object,
-                    CrossCallIPCCallback callback,
-                    void* context) override;
-
-  bool UnRegisterWaits(void* cookie) override;
-
-  // Returns the total number of wait objects associated with
-  // the thread pool.
-  size_t OutstandingWaits();
-
- private:
-  // record to keep track of a wait and its associated cookie.
-  struct PoolObject {
-    const void* cookie;
-    HANDLE wait;
-  };
-  // The list of pool wait objects.
-  typedef std::list<PoolObject> PoolObjects;
-  PoolObjects pool_objects_;
-  // This lock protects the list of pool wait objects.
-  CRITICAL_SECTION lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(Win2kThreadPool);
-};
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_SRC_WIN2K_THREADPOOL_H_