Standardize usage of virtual/override/final in content/renderer/

content/renderer/media/webrtc_local_audio_track_unittest.cc

 // Copyright 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 "base/synchronization/waitable_event.h"
 #include "base/test/test_timeouts.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/mock_media_constraint_factory.h"
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 #include "content/renderer/media/webrtc_audio_capturer.h"
@@ skipping 27 matching lines @@
  public:
   FakeAudioThread(WebRtcAudioCapturer* capturer,
                   const media::AudioParameters& params)
     : capturer_(capturer),
       thread_(),
       closure_(false, false) {
     DCHECK(capturer);
     audio_bus_ = media::AudioBus::Create(params);
   }
 
-  virtual ~FakeAudioThread() { DCHECK(thread_.is_null()); }
+  ~FakeAudioThread() override { DCHECK(thread_.is_null()); }
 
   // base::PlatformThread::Delegate:
-  virtual void ThreadMain() override {
+  void ThreadMain() override {
     while (true) {
       if (closure_.IsSignaled())
         return;
 
       media::AudioCapturerSource::CaptureCallback* callback =
           static_cast<media::AudioCapturerSource::CaptureCallback*>(
               capturer_);
       audio_bus_->Zero();
       callback->Capture(audio_bus_.get(), 0, 0, false);
 
@@ skipping 472 matching lines @@
   // Stopping the new source will stop the second track.
   EXPECT_CALL(*source.get(), OnStop()).Times(1);
   capturer->Stop();
 
   // Even though this test don't use |capturer_source_| it will be stopped
   // during teardown of the test harness.
   EXPECT_CALL(*capturer_source_.get(), OnStop());
 }
 
 }  // namespace content