Remove #pragma once from crypto

crypto/crypto_module_blocking_password_delegate.h

 // Copyright (c) 2011 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 CRYPTO_CRYPTO_MODULE_BLOCKING_PASSWORD_DELEGATE_H_
 #define CRYPTO_CRYPTO_MODULE_BLOCKING_PASSWORD_DELEGATE_H_
-#pragma once
 
 #include <string>
 
 namespace crypto {
 
 // PK11_SetPasswordFunc is a global setting.  An implementation of
 // CryptoModuleBlockingPasswordDelegate should be passed as the user data
 // argument (|wincx|) to relevant NSS functions, which the global password
 // handler will call to do the actual work.
 class CryptoModuleBlockingPasswordDelegate {
  public:
   virtual ~CryptoModuleBlockingPasswordDelegate() {}
 
   // Requests a password to unlock |slot_name|. The interface is
   // synchronous because NSS cannot issue an asynchronous
   // request. |retry| is true if this is a request for the retry
   // and we previously returned the wrong password.
   // The implementation should set |*cancelled| to true if the user cancelled
   // instead of entering a password, otherwise it should return the password the
   // user entered.
   virtual std::string RequestPassword(const std::string& slot_name, bool retry,
                                       bool* cancelled) = 0;
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_CRYPTO_MODULE_BLOCKING_PASSWORD_DELEGATE_H_