Standardize usage of virtual/override/final in media/

media/audio/clockless_audio_sink.cc

Index: media/audio/clockless_audio_sink.cc
diff --git a/media/audio/clockless_audio_sink.cc b/media/audio/clockless_audio_sink.cc
index 1bb22e2d837c80a584d3277c3da62cf2b9e3f465..88e25b8af8db6c70912b11dca429d54f20c21e9e 100644
--- a/media/audio/clockless_audio_sink.cc
+++ b/media/audio/clockless_audio_sink.cc
@@ -35,7 +35,7 @@ class ClocklessAudioSinkThread : public base::DelegateSimpleThread::Delegate {
 
  private:
    // Call Render() repeatedly, keeping track of the rendering time.
-   virtual void Run() override {
+  void Run() override {
      base::TimeTicks start;
      while (!stop_event_->IsSignaled()) {
        int frames_received = callback_->Render(audio_bus_.get(), 0);