Standardize usage of virtual/override/final specifiers.

media/cast/net/rtcp/rtcp_unittest.cc

 // Copyright 2014 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 <stdint.h>
 
 #include "base/test/simple_test_tick_clock.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/net/cast_transport_config.h"
 #include "media/cast/net/pacing/paced_sender.h"
@@ skipping 101 matching lines @@
                            kSenderSsrc) {
     sender_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
     receiver_clock_->SetSkew(
         1.0,  // No skew.
         base::TimeDelta::FromSeconds(kInitialReceiverClockOffsetSeconds));
 
     sender_to_receiver_.set_rtcp_destination(&rtcp_for_receiver_);
     receiver_to_sender_.set_rtcp_destination(&rtcp_for_sender_);
   }
 
-  virtual ~RtcpTest() {}
+  ~RtcpTest() override {}
 
   scoped_ptr<base::SimpleTestTickClock> sender_clock_;
   scoped_ptr<test::SkewedTickClock> receiver_clock_;
   FakeRtcpTransport sender_to_receiver_;
   FakeRtcpTransport receiver_to_sender_;
   MockFrameSender mock_frame_sender_;
   Rtcp rtcp_for_sender_;
   Rtcp rtcp_for_receiver_;
   FakeReceiverStats stats_;
 
@@ skipping 125 matching lines @@
   base::TimeTicks out_3 = ConvertNtpToTimeTicks(ntp_seconds_3, ntp_fraction_3);
   EXPECT_EQ(input_time, out_3);  // Verify inverse.
 
   // Verify delta.
   EXPECT_EQ((out_3 - out_2), time_delta);
   EXPECT_NEAR((ntp_fraction_3 - ntp_fraction_2), 0xffffffff / 2, 1);
 }
 
 }  // namespace cast
 }  // namespace media