Standardize usage of virtual/override/final in net/

net/quic/quic_http_stream_test.cc

Index: net/quic/quic_http_stream_test.cc
diff --git a/net/quic/quic_http_stream_test.cc b/net/quic/quic_http_stream_test.cc
index b6ecc776dba8d4633cff35d5871c7dfbcb58f414..53be4dd1455f046b48a0c6d47106796c59e8ff70 100644
--- a/net/quic/quic_http_stream_test.cc
+++ b/net/quic/quic_http_stream_test.cc
@@ -98,7 +98,7 @@ class AutoClosingStream : public QuicHttpStream {
       : QuicHttpStream(session) {
   }
 
-  virtual int OnDataReceived(const char* data, int length) override {
+  int OnDataReceived(const char* data, int length) override {
     Close(false);
     return OK;
   }
@@ -108,9 +108,9 @@ class TestPacketWriterFactory : public QuicConnection::PacketWriterFactory {
  public:
   explicit TestPacketWriterFactory(DatagramClientSocket* socket)
       : socket_(socket) {}
-  virtual ~TestPacketWriterFactory() {}
+  ~TestPacketWriterFactory() override {}
 
-  virtual QuicPacketWriter* Create(QuicConnection* connection) const override {
+  QuicPacketWriter* Create(QuicConnection* connection) const override {
     return new QuicDefaultPacketWriter(socket_);
   }