Standardize usage of virtual/override/final specifiers.

media/base/audio_block_fifo_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 "base/time/time.h"
 #include "media/audio/audio_power_monitor.h"
 #include "media/base/audio_block_fifo.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class AudioBlockFifoTest : public testing::Test {
  public:
   AudioBlockFifoTest() {}
-  virtual ~AudioBlockFifoTest() {}
+  ~AudioBlockFifoTest() override {}
 
   void PushAndVerify(AudioBlockFifo* fifo, int frames_to_push,
                      int channels, int block_frames, int max_frames) {
     for (int filled_frames = max_frames - fifo->GetUnfilledFrames();
          filled_frames + frames_to_push <= max_frames;) {
       Push(fifo, frames_to_push, channels);
       filled_frames += frames_to_push;
       EXPECT_EQ(max_frames - filled_frames, fifo->GetUnfilledFrames());
       EXPECT_EQ(static_cast<int>(filled_frames / block_frames),
                 fifo->available_blocks());
@@ skipping 191 matching lines @@
                      expected_available_blocks);
   }
 
   // Fill up one block of buffer and consume it, FIFO should then be empty.
   const int available_frames = max_frames - expected_unfilled_frames;
   Push(&fifo, frames - available_frames, channels);
   ConsumeAndVerify(&fifo, max_frames, 0);
 }
 
 }  // namespace media