Deleted OS_WIN and all Windows specific files from base.

base/debug/gdi_debug_util_win.h

-// 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.
-
-#ifndef BASE_DEBUG_GDI_DEBUG_UTIL_WIN_H_
-#define BASE_DEBUG_GDI_DEBUG_UTIL_WIN_H_
-
-#include <windows.h>
-
-#include "base/base_export.h"
-
-namespace base {
-namespace debug {
-
-// Crashes the process leaving valuable information on the dump via
-// debug::alias so we can find what is causing the allocation failures.
-void BASE_EXPORT GDIBitmapAllocFailure(BITMAPINFOHEADER* header,
-                                       HANDLE shared_section);
-
-}  // namespace debug
-}  // namespace base
-
-#endif  // BASE_DEBUG_GDI_DEBUG_UTIL_WIN_H_