Standardize usage of virtual/override/final specifiers.

content/browser/renderer_host/media/audio_renderer_host_unittest.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/bind.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "base/sync_socket.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
@@ skipping 139 matching lines @@
     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
     host_ = new MockAudioRendererHost(audio_manager_.get(),
                                       &mirroring_manager_,
                                       MediaInternals::GetInstance(),
                                       media_stream_manager_.get());
 
     // Simulate IPC channel connected.
     host_->set_peer_pid_for_testing(base::GetCurrentProcId());
   }
 
-  virtual ~AudioRendererHostTest() {
+  ~AudioRendererHostTest() override {
     // Simulate closing the IPC channel and give the audio thread time to close
     // the underlying streams.
     host_->OnChannelClosing();
     SyncWithAudioThread();
 
     // Release the reference to the mock object.  The object will be destructed
     // on message_loop_.
     host_ = NULL;
   }
 
@@ skipping 162 matching lines @@
 }
 
 TEST_F(AudioRendererHostTest, CreateUnifiedStreamAndClose) {
   Create(true);
   Close();
 }
 
 // TODO(hclam): Add tests for data conversation in low latency mode.
 
 }  // namespace content