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

Source/platform/audio/AudioDSPKernelProcessor.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 40 matching lines @@
 class PLATFORM_EXPORT AudioDSPKernelProcessor : public AudioProcessor {
 public:
     // numberOfChannels may be later changed if object is not yet in an "initialized" state
     AudioDSPKernelProcessor(float sampleRate, unsigned numberOfChannels);
 
     // Subclasses create the appropriate type of processing kernel here.
     // We'll call this to create a kernel for each channel.
     virtual PassOwnPtr<AudioDSPKernel> createKernel() = 0;
 
     // AudioProcessor methods
-    virtual void initialize() override;
-    virtual void uninitialize() override;
-    virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
-    virtual void reset() override;
-    virtual void setNumberOfChannels(unsigned) override;
-    virtual unsigned numberOfChannels() const override { return m_numberOfChannels; }
+    void initialize() override;
+    void uninitialize() override;
+    void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
+    void reset() override;
+    void setNumberOfChannels(unsigned) override;
+    unsigned numberOfChannels() const override { return m_numberOfChannels; }
 
-    virtual double tailTime() const override;
-    virtual double latencyTime() const override;
+    double tailTime() const override;
+    double latencyTime() const override;
 
 protected:
     Vector<OwnPtr<AudioDSPKernel>> m_kernels;
     mutable Mutex m_processLock;
     bool m_hasJustReset;
 };
 
 } // namespace blink
 
 #endif // AudioDSPKernelProcessor_h