Standardize usage of virtual/override/final specifiers.

media/cast/sender/external_video_encoder_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 <vector>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/video_frame.h"
@@ skipping 130 matching lines @@
     video_encoder_.reset(new ExternalVideoEncoder(
         cast_environment_,
         video_config_,
         base::Bind(&IgnoreInitializationStatus),
         base::Bind(&VEAFactory::CreateVideoEncodeAccelerator,
                    base::Unretained(&vea_factory)),
         base::Bind(&CreateSharedMemory)));
     vea_factory.FinishCreatingVideoEncodeAccelerator();
   }
 
-  virtual ~ExternalVideoEncoderTest() {}
+  ~ExternalVideoEncoderTest() override {}
 
   void AdvanceClockAndVideoFrameTimestamp() {
     testing_clock_->Advance(base::TimeDelta::FromMilliseconds(33));
     video_frame_->set_timestamp(
         video_frame_->timestamp() + base::TimeDelta::FromMilliseconds(33));
   }
 
   base::SimpleTestTickClock* testing_clock_;  // Owned by CastEnvironment.
   test::FakeVideoEncodeAccelerator* fake_vea_;  // Owned by video_encoder_.
   std::vector<uint32> stored_bitrates_;
@@ skipping 90 matching lines @@
                  base::Unretained(&vea_factory)),
       base::Bind(&CreateSharedMemory)));
 
   video_encoder.reset();
   vea_factory.FinishCreatingVideoEncodeAccelerator();
   task_runner->RunTasks();
 }
 
 }  // namespace cast
 }  // namespace media