Standardize usage of virtual/override/final in net/

net/quic/crypto/aead_base_encrypter.h

Index: net/quic/crypto/aead_base_encrypter.h
diff --git a/net/quic/crypto/aead_base_encrypter.h b/net/quic/crypto/aead_base_encrypter.h
index 89c7a1fce54409b8aa20e86f152463fafd090883..7d9b6fc57e7b39588eecc7ad3aa1c19fec168d1d 100644
--- a/net/quic/crypto/aead_base_encrypter.h
+++ b/net/quic/crypto/aead_base_encrypter.h
@@ -37,24 +37,24 @@ class NET_EXPORT_PRIVATE AeadBaseEncrypter : public QuicEncrypter {
                     size_t auth_tag_size,
                     size_t nonce_prefix_size);
 #endif
-  virtual ~AeadBaseEncrypter();
+  ~AeadBaseEncrypter() override;
 
   // QuicEncrypter implementation
-  virtual bool SetKey(base::StringPiece key) override;
-  virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
-  virtual bool Encrypt(base::StringPiece nonce,
-                       base::StringPiece associated_data,
-                       base::StringPiece plaintext,
-                       unsigned char* output) override;
-  virtual QuicData* EncryptPacket(QuicPacketSequenceNumber sequence_number,
-                                  base::StringPiece associated_data,
-                                  base::StringPiece plaintext) override;
-  virtual size_t GetKeySize() const override;
-  virtual size_t GetNoncePrefixSize() const override;
-  virtual size_t GetMaxPlaintextSize(size_t ciphertext_size) const override;
-  virtual size_t GetCiphertextSize(size_t plaintext_size) const override;
-  virtual base::StringPiece GetKey() const override;
-  virtual base::StringPiece GetNoncePrefix() const override;
+  bool SetKey(base::StringPiece key) override;
+  bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
+  bool Encrypt(base::StringPiece nonce,
+               base::StringPiece associated_data,
+               base::StringPiece plaintext,
+               unsigned char* output) override;
+  QuicData* EncryptPacket(QuicPacketSequenceNumber sequence_number,
+                          base::StringPiece associated_data,
+                          base::StringPiece plaintext) override;
+  size_t GetKeySize() const override;
+  size_t GetNoncePrefixSize() const override;
+  size_t GetMaxPlaintextSize(size_t ciphertext_size) const override;
+  size_t GetCiphertextSize(size_t plaintext_size) const override;
+  base::StringPiece GetKey() const override;
+  base::StringPiece GetNoncePrefix() const override;
 
  protected:
   // Make these constants available to the subclasses so that the subclasses