Standardize usage of virtual/override/final specifiers.

net/quic/congestion_control/pacing_sender_test.cc

 // Copyright (c) 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/quic/congestion_control/pacing_sender.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/test_tools/mock_clock.h"
@@ skipping 17 matching lines @@
         infinite_time_(QuicTime::Delta::Infinite()),
         sequence_number_(1),
         mock_sender_(new StrictMock<MockSendAlgorithm>()),
         pacing_sender_(new PacingSender(mock_sender_,
                                         QuicTime::Delta::FromMilliseconds(1),
                                         0)) {
     // Pick arbitrary time.
     clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(9));
   }
 
-  virtual ~PacingSenderTest() {}
+  ~PacingSenderTest() override {}
 
   void CheckPacketIsSentImmediately() {
     // In order for the packet to be sendable, the underlying sender must
     // permit it to be sent immediately.
     for (int i = 0; i < 2; ++i) {
       EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
                                                kBytesInFlight,
                                                HAS_RETRANSMITTABLE_DATA))
           .WillOnce(Return(zero_time_));
       // Verify that the packet can be sent immediately.
@@ skipping 311 matching lines @@
   // The first packet was a "make up", then we sent two packets "into the
   // future", so the delay should be 2ms.
   CheckPacketIsSentImmediately();
   CheckPacketIsSentImmediately();
   CheckPacketIsSentImmediately();
   CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
 }
 
 }  // namespace test
 }  // namespace net