Remove #pragma once from sync

sync/test/fake_encryptor.h

 // Copyright (c) 2012 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 SYNC_TEST_FAKE_ENCRYPTOR_H_
 #define SYNC_TEST_FAKE_ENCRYPTOR_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "sync/util/encryptor.h"
 
 namespace syncer {
 
 // Encryptor which simply base64-encodes the plaintext to get the
 // ciphertext.  Obviously, this should be used only for testing.
 class FakeEncryptor : public Encryptor {
  public:
   virtual ~FakeEncryptor();
 
   virtual bool EncryptString(const std::string& plaintext,
                              std::string* ciphertext) OVERRIDE;
 
   virtual bool DecryptString(const std::string& ciphertext,
                              std::string* plaintext) OVERRIDE;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_FAKE_ENCRYPTOR_H_