Fix virtual/override/final usage in Source/core/html/.

Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 55 matching lines @@
 #endif
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 };
 
 class CORE_EXPORT HTMLCanvasElement final : public HTMLElement, public DocumentVisibilityObserver, public CanvasImageSource, public ImageBufferClient {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLCanvasElement);
 public:
     DECLARE_NODE_FACTORY(HTMLCanvasElement);
-    virtual ~HTMLCanvasElement();
+    ~HTMLCanvasElement() override;
 
     void addObserver(CanvasObserver*);
     void removeObserver(CanvasObserver*);
 
     // Attributes and functions exposed to script
     int width() const { return size().width(); }
     int height() const { return size().height(); }
 
     const IntSize& size() const { return m_size; }
 
@@ skipping 47 matching lines @@
 
     bool is3D() const;
 
     bool hasImageBuffer() const { return m_imageBuffer; }
     void discardImageBuffer();
 
     bool shouldAccelerate(const IntSize&) const;
 
     bool shouldBeDirectComposited() const;
 
-    virtual const AtomicString imageSourceURL() const override;
+    const AtomicString imageSourceURL() const override;
 
-    virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
+    InsertionNotificationRequest insertedInto(ContainerNode*) override;
 
     // DocumentVisibilityObserver implementation
-    virtual void didChangeVisibilityState(PageVisibilityState) override;
+    void didChangeVisibilityState(PageVisibilityState) override;
 
     // CanvasImageSource implementation
-    virtual PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const override;
-    virtual bool wouldTaintOrigin(SecurityOrigin*) const override;
-    virtual FloatSize elementSize() const override;
-    virtual bool isCanvasElement() const override { return true; }
-    virtual bool isOpaque() const override;
+    PassRefPtr<Image> getSourceImageForCanvas(SourceImageMode, SourceImageStatus*) const override;
+    bool wouldTaintOrigin(SecurityOrigin*) const override;
+    FloatSize elementSize() const override;
+    bool isCanvasElement() const override { return true; }
+    bool isOpaque() const override;
 
     // ImageBufferClient implementation
-    virtual void notifySurfaceInvalid() override;
-    virtual bool isDirty() override { return !m_dirtyRect.isEmpty(); }
-    virtual void didFinalizeFrame() override;
-    virtual void restoreCanvasMatrixClipStack() override;
+    void notifySurfaceInvalid() override;
+    bool isDirty() override { return !m_dirtyRect.isEmpty(); }
+    void didFinalizeFrame() override;
+    void restoreCanvasMatrixClipStack() override;
 
     void doDeferredPaintInvalidation();
 
     DECLARE_VIRTUAL_TRACE();
 
     void createImageBufferUsingSurfaceForTesting(PassOwnPtr<ImageBufferSurface>);
 
     static void registerRenderingContextFactory(PassOwnPtr<CanvasRenderingContextFactory>);
 
 protected:
-    virtual void didMoveToNewDocument(Document& oldDocument) override;
+    void didMoveToNewDocument(Document& oldDocument) override;
 
 private:
     explicit HTMLCanvasElement(Document&);
 
     using ContextFactoryVector = Vector<OwnPtr<CanvasRenderingContextFactory>>;
     static ContextFactoryVector& renderingContextFactories();
     static CanvasRenderingContextFactory* getRenderingContextFactory(int);
 
-    virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
-    virtual LayoutObject* createLayoutObject(const ComputedStyle&) override;
-    virtual void didRecalcStyle(StyleRecalcChange) override;
-    virtual bool areAuthorShadowsAllowed() const override { return false; }
+    void parseAttribute(const QualifiedName&, const AtomicString&) override;
+    LayoutObject* createLayoutObject(const ComputedStyle&) override;
+    void didRecalcStyle(StyleRecalcChange) override;
+    bool areAuthorShadowsAllowed() const override { return false; }
 
     void reset();
 
     PassOwnPtr<ImageBufferSurface> createImageBufferSurface(const IntSize& deviceSize, int* msaaSampleCount);
     void createImageBuffer();
     void createImageBufferInternal(PassOwnPtr<ImageBufferSurface> externalSurface);
     bool shouldUseDisplayList(const IntSize& deviceSize);
 
     void setSurfaceSize(const IntSize&);
 
@@ skipping 22 matching lines @@
     mutable bool m_didFailToCreateImageBuffer;
     bool m_imageBufferIsClear;
     OwnPtr<ImageBuffer> m_imageBuffer;
 
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 };
 
 } // namespace blink
 
 #endif // HTMLCanvasElement_h