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

Source/platform/exported/WebScrollbarImpl.h

 /*
  * Copyright (C) 2012 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 
 class Scrollbar;
 class PLATFORM_EXPORT WebScrollbarImpl final : public WebScrollbar {
 public:
     static WebScrollbarImpl* create(Scrollbar* scrollbar)
     {
         return new WebScrollbarImpl(scrollbar);
     }
 
     // Implement WebScrollbar methods
-    virtual bool isOverlay() const override;
-    virtual int value() const override;
-    virtual WebPoint location() const override;
-    virtual WebSize size() const override;
-    virtual bool enabled() const override;
-    virtual int maximum() const override;
-    virtual int totalSize() const override;
-    virtual bool isScrollableAreaActive() const override;
-    virtual void getTickmarks(WebVector<WebRect>& tickmarks) const override;
-    virtual ScrollbarControlSize controlSize() const override;
-    virtual ScrollbarPart pressedPart() const override;
-    virtual ScrollbarPart hoveredPart() const override;
-    virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
-    virtual bool isCustomScrollbar() const override;
-    virtual Orientation orientation() const override;
-    virtual bool isLeftSideVerticalScrollbar() const override;
-    virtual bool isAlphaLocked() const override;
-    virtual void setIsAlphaLocked(bool) override;
-    virtual float elasticOverscroll() const override;
-    virtual void setElasticOverscroll(float) override;
+    bool isOverlay() const override;
+    int value() const override;
+    WebPoint location() const override;
+    WebSize size() const override;
+    bool enabled() const override;
+    int maximum() const override;
+    int totalSize() const override;
+    bool isScrollableAreaActive() const override;
+    void getTickmarks(WebVector<WebRect>& tickmarks) const override;
+    ScrollbarControlSize controlSize() const override;
+    ScrollbarPart pressedPart() const override;
+    ScrollbarPart hoveredPart() const override;
+    ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
+    bool isCustomScrollbar() const override;
+    Orientation orientation() const override;
+    bool isLeftSideVerticalScrollbar() const override;
+    bool isAlphaLocked() const override;
+    void setIsAlphaLocked(bool) override;
+    float elasticOverscroll() const override;
+    void setElasticOverscroll(float) override;
 
 private:
     explicit WebScrollbarImpl(Scrollbar*);
 
     RefPtrWillBePersistent<Scrollbar> m_scrollbar;
 };
 
 } // namespace blink
 
 #endif