Fix virtual/override/final usage in Source/platform/.

Source/platform/audio/HRTFPanner.h

Index: Source/platform/audio/HRTFPanner.h
diff --git a/Source/platform/audio/HRTFPanner.h b/Source/platform/audio/HRTFPanner.h
index 6bc4ea714a6ae0cdbc8e4baa26d4dc5e60c8ba3e..84f7585cbc93358abcf27283ce7a7d28f3f9e8ee 100644
--- a/Source/platform/audio/HRTFPanner.h
+++ b/Source/platform/audio/HRTFPanner.h
@@ -35,19 +35,19 @@ namespace blink {
 class PLATFORM_EXPORT HRTFPanner final : public Panner {
 public:
     HRTFPanner(float sampleRate, HRTFDatabaseLoader*);
-    virtual ~HRTFPanner();
+    ~HRTFPanner() override;
 
     // Panner
-    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) override;
-    virtual void reset() override;
+    void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) override;
+    void reset() override;
 
     size_t fftSize() const { return fftSizeForSampleRate(m_sampleRate); }
     static size_t fftSizeForSampleRate(float sampleRate);
 
     float sampleRate() const { return m_sampleRate; }
 
-    virtual double tailTime() const override;
-    virtual double latencyTime() const override;
+    double tailTime() const override;
+    double latencyTime() const override;
 
 private:
     // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,