Remove #pragma once from crypto

crypto/third_party/nss/chromium-nss.h

  /* ***** BEGIN LICENSE BLOCK *****
   * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   *
   * The contents of this file are subject to the Mozilla Public License Version
   * 1.1 (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   * http://www.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
@@ skipping 18 matching lines @@
   * use your version of this file under the terms of the MPL, indicate your
   * decision by deleting the provisions above and replace them with the notice
   * and other provisions required by the GPL or the LGPL. If you do not delete
   * the provisions above, a recipient may use your version of this file under
   * the terms of any one of the MPL, the GPL or the LGPL.
   *
   * ***** END LICENSE BLOCK ***** */
 
 #ifndef CRYPTO_THIRD_PARTY_NSS_CHROMIUM_NSS_H_
 #define CRYPTO_THIRD_PARTY_NSS_CHROMIUM_NSS_H_
-#pragma once
 
 // This file contains some functions we borrowed from NSS.
 
 #include <keyhi.h>
 #include <secmod.h>
 
 #include "crypto/crypto_export.h"
 
 // Like PK11_ImportEncryptedPrivateKeyInfo, but hardcoded for EC, and returns
 // the SECKEYPrivateKey.
@@ skipping 12 matching lines @@
     void* wincx);
 
 // Like SEC_DerSignData.
 CRYPTO_EXPORT SECStatus DerSignData(PLArenaPool *arena,
                                     SECItem *result,
                                     SECItem *input,
                                     SECKEYPrivateKey *key,
                                     SECOidTag algo_id);
 
 #endif  // CRYPTO_THIRD_PARTY_NSS_CHROMIUM_NSS_H_