Standardize usage of virtual/override/final in net/

net/quic/test_tools/quic_test_utils.cc

Index: net/quic/test_tools/quic_test_utils.cc
diff --git a/net/quic/test_tools/quic_test_utils.cc b/net/quic/test_tools/quic_test_utils.cc
index 6cdd02acba4c8acebd2f8c6178bb5b2c3663fddd..7835e409b32697529d97a8ce427c9510ed50308b 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -37,8 +37,8 @@ class TestAlarm : public QuicAlarm {
       : QuicAlarm(delegate) {
   }
 
-  virtual void SetImpl() override {}
-  virtual void CancelImpl() override {}
+  void SetImpl() override {}
+  void CancelImpl() override {}
 };
 
 }  // namespace
@@ -226,10 +226,9 @@ class NiceMockPacketWriterFactory
     : public QuicConnection::PacketWriterFactory {
  public:
   NiceMockPacketWriterFactory() {}
-  virtual ~NiceMockPacketWriterFactory() {}
+  ~NiceMockPacketWriterFactory() override {}
 
-  virtual QuicPacketWriter* Create(
-      QuicConnection* /*connection*/) const override {
+  QuicPacketWriter* Create(QuicConnection* /*connection*/) const override {
     return new testing::NiceMock<MockPacketWriter>();
   }