Use override instead of virtual..override in ./net/quic/... and

net/tools/quic/quic_server_session_test.cc

 // Copyright 2013 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/quic_server_session.h"
 
 #include "net/quic/crypto/cached_network_parameters.h"
 #include "net/quic/crypto/quic_crypto_server_config.h"
 #include "net/quic/crypto/quic_random.h"
 #include "net/quic/quic_connection.h"
@@ skipping 274 matching lines @@
       session_.get(), kClientDataStreamId1);
   ASSERT_TRUE(stream);
   EXPECT_EQ(FEC_PROTECT_OPTIONAL, stream->fec_policy());
 }
 
 class MockQuicCryptoServerStream : public QuicCryptoServerStream {
  public:
   explicit MockQuicCryptoServerStream(
       const QuicCryptoServerConfig& crypto_config, QuicSession* session)
       : QuicCryptoServerStream(crypto_config, session) {}
-  virtual ~MockQuicCryptoServerStream() {}
+  ~MockQuicCryptoServerStream() override {}
 
   MOCK_METHOD1(SendServerConfigUpdate,
                void(const CachedNetworkParameters* cached_network_parameters));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockQuicCryptoServerStream);
 };
 
 TEST_P(QuicServerSessionTest, BandwidthEstimates) {
   if (version() <= QUIC_VERSION_21) {
@@ skipping 74 matching lines @@
   EXPECT_CALL(*crypto_stream,
               SendServerConfigUpdate(EqualsProto(expected_network_params)))
       .Times(1);
   session_->OnCongestionWindowChange(now);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net