Update from chromium https://crrev.com/301725/

net/tools/quic/test_tools/quic_test_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/test_tools/quic_test_utils.h"
 
 #include "net/quic/quic_connection.h"
 #include "net/quic/test_tools/quic_connection_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "net/tools/quic/quic_epoll_connection_helper.h"
 
 using base::StringPiece;
 using net::test::MakeAckFrame;
 using net::test::MockHelper;
 using net::test::QuicConnectionPeer;
 
 namespace net {
 namespace tools {
 namespace test {
 
 namespace {
 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>();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NiceMockPacketWriterFactory);
 };
 }  // namespace
 
 MockConnection::MockConnection(bool is_server)
     : QuicConnection(kTestConnectionId,
@@ skipping 134 matching lines @@
   factory_->current_writer_ = this;
   return QuicPerConnectionPacketWriter::WritePacket(buffer,
                                                     buf_len,
                                                     self_address,
                                                     peer_address);
 }
 
 }  // namespace test
 }  // namespace tools
 }  // namespace net