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

components/os_crypt/os_crypt_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 "components/os_crypt/os_crypt.h"
 
 #include <windows.h>
-#include <wincrypt.h>
 
 #include "base/strings/utf_string_conversions.h"
+#include "crypto/wincrypt_shim.h"
 
 #pragma comment(lib, "crypt32.lib")
 
 bool OSCrypt::EncryptString16(const base::string16& plaintext,
                               std::string* ciphertext) {
   return EncryptString(base::UTF16ToUTF8(plaintext), ciphertext);
 }
 
 bool OSCrypt::DecryptString16(const std::string& ciphertext,
                               base::string16* plaintext) {
@@ skipping 36 matching lines @@
   DATA_BLOB output;
   BOOL result = CryptUnprotectData(&input, NULL, NULL, NULL, NULL,
                                    0, &output);
   if (!result)
     return false;
 
   plaintext->assign(reinterpret_cast<char*>(output.pbData), output.cbData);
   LocalFree(output.pbData);
   return true;
 }