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

net/quic/congestion_control/hybrid_slow_start_test.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 "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/quic/congestion_control/hybrid_slow_start.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
 class HybridSlowStartTest : public ::testing::Test {
  protected:
   HybridSlowStartTest()
      : one_ms_(QuicTime::Delta::FromMilliseconds(1)),
        rtt_(QuicTime::Delta::FromMilliseconds(60)) {
   }
-  virtual void SetUp() {
-    slow_start_.reset(new HybridSlowStart(&clock_));
-  }
+  void SetUp() override { slow_start_.reset(new HybridSlowStart(&clock_)); }
   const QuicTime::Delta one_ms_;
   const QuicTime::Delta rtt_;
   MockClock clock_;
   scoped_ptr<HybridSlowStart> slow_start_;
 };
 
 TEST_F(HybridSlowStartTest, Simple) {
   QuicPacketSequenceNumber sequence_number = 1;
   QuicPacketSequenceNumber end_sequence_number = 3;
   slow_start_->StartReceiveRound(end_sequence_number);
@@ skipping 65 matching lines @@
         rtt_.Add(QuicTime::Delta::FromMilliseconds(n + 5)), rtt_, 100));
   }
   // Expect to trigger since all packets in this burst was above the long term
   // RTT provided.
   EXPECT_TRUE(slow_start_->ShouldExitSlowStart(
       rtt_.Add(QuicTime::Delta::FromMilliseconds(5)), rtt_, 100));
 }
 
 }  // namespace test
 }  // namespace net