Deleted OS_WIN and all Windows specific files from base.

base/rand_util_win.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 "base/rand_util.h"
-
-#include <windows.h>
-
-// #define needed to link in RtlGenRandom(), a.k.a. SystemFunction036.  See the
-// "Community Additions" comment on MSDN here:
-// http://msdn.microsoft.com/en-us/library/windows/desktop/aa387694.aspx
-#define SystemFunction036 NTAPI SystemFunction036
-#include <NTSecAPI.h>
-#undef SystemFunction036
-
-#include <algorithm>
-#include <limits>
-
-#include "base/logging.h"
-
-namespace base {
-
-// NOTE: This function must be cryptographically secure. http://crbug.com/140076
-uint64 RandUint64() {
-  uint64 number;
-  RandBytes(&number, sizeof(number));
-  return number;
-}
-
-void RandBytes(void* output, size_t output_length) {
-  char* output_ptr = static_cast<char*>(output);
-  while (output_length > 0) {
-    const ULONG output_bytes_this_pass = static_cast<ULONG>(std::min(
-        output_length, static_cast<size_t>(std::numeric_limits<ULONG>::max())));
-    const bool success =
-        RtlGenRandom(output_ptr, output_bytes_this_pass) != FALSE;
-    CHECK(success);
-    output_length -= output_bytes_this_pass;
-    output_ptr += output_bytes_this_pass;
-  }
-}
-
-}  // namespace base