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

Source/platform/exported/WebScrollbarThemeClientImpl.h

Index: Source/platform/exported/WebScrollbarThemeClientImpl.h
diff --git a/Source/platform/exported/WebScrollbarThemeClientImpl.h b/Source/platform/exported/WebScrollbarThemeClientImpl.h
index 6900746d79dad50f35d2b7dc6001f2b8189557c5..b0adda3282bc56a21798535132caa8678bccf8b8 100644
--- a/Source/platform/exported/WebScrollbarThemeClientImpl.h
+++ b/Source/platform/exported/WebScrollbarThemeClientImpl.h
@@ -40,46 +40,46 @@ public:
     // Caller must retain ownership of this pointer and ensure that its lifetime
     // exceeds this instance.
     WebScrollbarThemeClientImpl(WebScrollbar*);
-    virtual ~WebScrollbarThemeClientImpl();
+    ~WebScrollbarThemeClientImpl() override;
 
     // Implement ScrollbarThemeClient interface
-    virtual int x() const override;
-    virtual int y() const override;
-    virtual int width() const override;
-    virtual int height() const override;
-    virtual IntSize size() const override;
-    virtual IntPoint location() const override;
-    virtual Widget* parent() const override;
-    virtual Widget* root() const override;
-    virtual void setFrameRect(const IntRect&) override;
-    virtual IntRect frameRect() const override;
-    virtual void invalidate() override;
-    virtual void invalidateRect(const IntRect&) override;
-    virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
-    virtual void getTickmarks(Vector<IntRect>&) const override;
-    virtual bool isScrollableAreaActive() const override;
-    virtual IntPoint convertFromContainingWindow(const IntPoint&) override;
-    virtual bool isCustomScrollbar() const override;
-    virtual ScrollbarOrientation orientation() const override;
-    virtual bool isLeftSideVerticalScrollbar() const override;
-    virtual int value() const override;
-    virtual float currentPos() const override;
-    virtual int visibleSize() const override;
-    virtual int totalSize() const override;
-    virtual int maximum() const override;
-    virtual ScrollbarControlSize controlSize() const override;
-    virtual ScrollbarPart pressedPart() const override;
-    virtual ScrollbarPart hoveredPart() const override;
-    virtual void styleChanged() override;
-    virtual bool enabled() const override;
-    virtual void setEnabled(bool) override;
-    virtual bool isOverlayScrollbar() const override;
-    virtual bool isAlphaLocked() const override;
-    virtual void setIsAlphaLocked(bool) override;
-    virtual float elasticOverscroll() const override;
-    virtual void setElasticOverscroll(float) override;
-    virtual DisplayItemClient displayItemClient() const override;
-    virtual String debugName() const override;
+    int x() const override;
+    int y() const override;
+    int width() const override;
+    int height() const override;
+    IntSize size() const override;
+    IntPoint location() const override;
+    Widget* parent() const override;
+    Widget* root() const override;
+    void setFrameRect(const IntRect&) override;
+    IntRect frameRect() const override;
+    void invalidate() override;
+    void invalidateRect(const IntRect&) override;
+    ScrollbarOverlayStyle scrollbarOverlayStyle() const override;
+    void getTickmarks(Vector<IntRect>&) const override;
+    bool isScrollableAreaActive() const override;
+    IntPoint convertFromContainingWindow(const IntPoint&) override;
+    bool isCustomScrollbar() const override;
+    ScrollbarOrientation orientation() const override;
+    bool isLeftSideVerticalScrollbar() const override;
+    int value() const override;
+    float currentPos() const override;
+    int visibleSize() const override;
+    int totalSize() const override;
+    int maximum() const override;
+    ScrollbarControlSize controlSize() const override;
+    ScrollbarPart pressedPart() const override;
+    ScrollbarPart hoveredPart() const override;
+    void styleChanged() override;
+    bool enabled() const override;
+    void setEnabled(bool) override;
+    bool isOverlayScrollbar() const override;
+    bool isAlphaLocked() const override;
+    void setIsAlphaLocked(bool) override;
+    float elasticOverscroll() const override;
+    void setElasticOverscroll(float) override;
+    DisplayItemClient displayItemClient() const override;
+    String debugName() const override;
 
 private:
     WebScrollbar* m_scrollbar;