Standardize usage of virtual/override/final in net/

net/quic/crypto/aes_128_gcm_12_decrypter.h

 // Copyright (c) 2013 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 NET_QUIC_CRYPTO_AES_128_GCM_12_DECRYPTER_H_
 #define NET_QUIC_CRYPTO_AES_128_GCM_12_DECRYPTER_H_
 
 #include "net/quic/crypto/aead_base_decrypter.h"
 
 namespace net {
 
 // An Aes128Gcm12Decrypter is a QuicDecrypter that implements the
 // AEAD_AES_128_GCM_12 algorithm specified in RFC 5282. Create an instance by
 // calling QuicDecrypter::Create(kAESG).
 //
 // It uses an authentication tag of 12 bytes (96 bits). The fixed prefix
 // of the nonce is four bytes.
 class NET_EXPORT_PRIVATE Aes128Gcm12Decrypter : public AeadBaseDecrypter {
  public:
   enum {
     // Authentication tags are truncated to 96 bits.
     kAuthTagSize = 12,
   };
 
   Aes128Gcm12Decrypter();
-  virtual ~Aes128Gcm12Decrypter();
+  ~Aes128Gcm12Decrypter() override;
 
 #if !defined(USE_OPENSSL)
  protected:
   // AeadBaseDecrypter methods:
   virtual void FillAeadParams(base::StringPiece nonce,
                               base::StringPiece associated_data,
                               size_t auth_tag_size,
                               AeadParams* aead_params) const override;
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Aes128Gcm12Decrypter);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_AES_128_GCM_12_DECRYPTER_H_