Deleted OS_WIN and all Windows specific files from base.

base/guid_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/guid.h"
-
-#include <stdlib.h>
-
-#include <objbase.h>
-#include <windows.h>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-
-namespace base {
-
-std::string GenerateGUID() {
-  const int kGUIDSize = 39;
-
-  GUID guid;
-  HRESULT guid_result = CoCreateGuid(&guid);
-  DCHECK(SUCCEEDED(guid_result));
-  if (!SUCCEEDED(guid_result))
-    return std::string();
-
-  std::wstring guid_string;
-  int result = StringFromGUID2(guid,
-                               WriteInto(&guid_string, kGUIDSize), kGUIDSize);
-  DCHECK(result == kGUIDSize);
-  if (result != kGUIDSize)
-    return std::string();
-
-  return WideToUTF8(guid_string.substr(1, guid_string.length() - 2));
-}
-
-}  // namespace base