Standardize usage of virtual/override/final in net/

net/quic/quic_per_connection_packet_writer.h

Index: net/quic/quic_per_connection_packet_writer.h
diff --git a/net/quic/quic_per_connection_packet_writer.h b/net/quic/quic_per_connection_packet_writer.h
index 4e5e8c8a5f9bdbcc452f43399e3a28fb2648b681..6d913120ea69507f6ee071b573a0904b1ba0f34a 100644
--- a/net/quic/quic_per_connection_packet_writer.h
+++ b/net/quic/quic_per_connection_packet_writer.h
@@ -22,20 +22,20 @@ class QuicPerConnectionPacketWriter : public QuicPacketWriter {
   // Does not take ownership of |shared_writer| or |connection|.
   QuicPerConnectionPacketWriter(QuicServerPacketWriter* shared_writer,
                                 QuicConnection* connection);
-  virtual ~QuicPerConnectionPacketWriter();
+  ~QuicPerConnectionPacketWriter() override;
 
   QuicPacketWriter* shared_writer() const;
   QuicConnection* connection() const { return connection_; }
 
   // Default implementation of the QuicPacketWriter interface: Passes everything
   // to |shared_writer_|.
-  virtual WriteResult WritePacket(const char* buffer,
-                                  size_t buf_len,
-                                  const IPAddressNumber& self_address,
-                                  const IPEndPoint& peer_address) override;
-  virtual bool IsWriteBlockedDataBuffered() const override;
-  virtual bool IsWriteBlocked() const override;
-  virtual void SetWritable() override;
+  WriteResult WritePacket(const char* buffer,
+                          size_t buf_len,
+                          const IPAddressNumber& self_address,
+                          const IPEndPoint& peer_address) override;
+  bool IsWriteBlockedDataBuffered() const override;
+  bool IsWriteBlocked() const override;
+  void SetWritable() override;
 
  private:
   void OnWriteComplete(WriteResult result);