Add crypto/wincrypt_shim.h wrapper header to resolve BoringSSL conflicts.

net/cert/sha256_legacy_support_win.cc

 // 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.
 
 #include "net/cert/sha256_legacy_support_win.h"
 
-#include <windows.h>
-#include <wincrypt.h>
-
 #include <cert.h>
 #include <keyhi.h>
 #include <secoid.h>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
 #include "base/win/windows_version.h"
 #include "crypto/scoped_nss_types.h"
 
@@ skipping 166 matching lines @@
   if (rv != SECSuccess) {
     SetLastError(static_cast<DWORD>(NTE_BAD_SIGNATURE));
     return FALSE;
   }
   return TRUE;
 }
 
 }  // namespace sha256_interception
 
 }  // namespace net