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

Source/platform/image-decoders/webp/WEBPImageDecoder.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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 
 #include "webp/decode.h"
 #include "webp/demux.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT WEBPImageDecoder : public ImageDecoder {
     WTF_MAKE_NONCOPYABLE(WEBPImageDecoder);
 public:
     WEBPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
-    virtual ~WEBPImageDecoder();
+    ~WEBPImageDecoder() override;
 
     // ImageDecoder:
-    virtual String filenameExtension() const override { return "webp"; }
-    virtual bool hasColorProfile() const override { return m_hasColorProfile; }
-    virtual void setData(SharedBuffer* data, bool allDataReceived) override;
-    virtual int repetitionCount() const override;
-    virtual bool frameIsCompleteAtIndex(size_t) const override;
-    virtual float frameDurationAtIndex(size_t) const override;
-    virtual size_t clearCacheExceptFrame(size_t) override;
+    String filenameExtension() const override { return "webp"; }
+    bool hasColorProfile() const override { return m_hasColorProfile; }
+    void setData(SharedBuffer* data, bool allDataReceived) override;
+    int repetitionCount() const override;
+    bool frameIsCompleteAtIndex(size_t) const override;
+    float frameDurationAtIndex(size_t) const override;
+    size_t clearCacheExceptFrame(size_t) override;
 
 private:
     // ImageDecoder:
     virtual void decodeSize() { updateDemuxer(); }
-    virtual size_t decodeFrameCount() override;
-    virtual void initializeNewFrame(size_t) override;
-    virtual void decode(size_t) override;
+    size_t decodeFrameCount() override;
+    void initializeNewFrame(size_t) override;
+    void decode(size_t) override;
 
     bool decodeSingleFrame(const uint8_t* dataBytes, size_t dataSize, size_t frameIndex);
 
     WebPIDecoder* m_decoder;
     WebPDecBuffer m_decoderBuffer;
     int m_formatFlags;
     bool m_frameBackgroundHasAlpha;
     bool m_hasColorProfile;
 
 #if USE(QCMSLIB)
     qcms_transform* colorTransform() const { return m_transform; }
     bool createColorTransform(const char* data, size_t);
     void clearColorTransform();
     void readColorProfile();
 
     qcms_transform* m_transform;
 #endif
 
     bool updateDemuxer();
     bool initFrameBuffer(size_t frameIndex);
     void applyPostProcessing(size_t frameIndex);
-    virtual void clearFrameBuffer(size_t frameIndex) override;
+    void clearFrameBuffer(size_t frameIndex) override;
 
     WebPDemuxer* m_demux;
     WebPDemuxState m_demuxState;
     bool m_haveAlreadyParsedThisData;
     int m_repetitionCount;
     int m_decodedHeight;
 
     typedef void (*AlphaBlendFunction)(ImageFrame&, ImageFrame&, int, int, int);
     AlphaBlendFunction m_blendFunction;
 
     void clear();
     void clearDecoder();
 };
 
 } // namespace blink
 
 #endif