Standardize usage of virtual/override/final in net/

net/quic/quic_server_session.h

Index: net/quic/quic_server_session.h
diff --git a/net/quic/quic_server_session.h b/net/quic/quic_server_session.h
index 80b644314e96444c8c492c3f7aa275d528c21758..2f0bdea0a2d202a7e715f1e7e68304876b1e373a 100644
--- a/net/quic/quic_server_session.h
+++ b/net/quic/quic_server_session.h
@@ -49,14 +49,14 @@ class QuicServerSession : public QuicSession {
                     QuicServerSessionVisitor* visitor);
 
   // Override the base class to notify the owner of the connection close.
-  virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) override;
-  virtual void OnWriteBlocked() override;
+  void OnConnectionClosed(QuicErrorCode error, bool from_peer) override;
+  void OnWriteBlocked() override;
 
   // Sends a server config update to the client, containing new bandwidth
   // estimate.
-  virtual void OnCongestionWindowChange(QuicTime now) override;
+  void OnCongestionWindowChange(QuicTime now) override;
 
-  virtual ~QuicServerSession();
+  ~QuicServerSession() override;
 
   virtual void InitializeSession(const QuicCryptoServerConfig& crypto_config);
 
@@ -65,7 +65,7 @@ class QuicServerSession : public QuicSession {
   }
 
   // Override base class to process FEC config received from client.
-  virtual void OnConfigNegotiated() override;
+  void OnConfigNegotiated() override;
 
   void set_serving_region(string serving_region) {
     serving_region_ = serving_region;
@@ -73,9 +73,9 @@ class QuicServerSession : public QuicSession {
 
  protected:
   // QuicSession methods:
-  virtual QuicDataStream* CreateIncomingDataStream(QuicStreamId id) override;
-  virtual QuicDataStream* CreateOutgoingDataStream() override;
-  virtual QuicCryptoServerStream* GetCryptoStream() override;
+  QuicDataStream* CreateIncomingDataStream(QuicStreamId id) override;
+  QuicDataStream* CreateOutgoingDataStream() override;
+  QuicCryptoServerStream* GetCryptoStream() override;
 
   // If we should create an incoming stream, returns true. Otherwise
   // does error handling, including communicating the error to the client and