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

Source/core/layout/LayoutButton.h

Index: Source/core/layout/LayoutButton.h
diff --git a/Source/core/layout/LayoutButton.h b/Source/core/layout/LayoutButton.h
index 2102a4b8c68f299c7238beeb8bc0a2b72e13327e..bd22f834d915c1e2cf691a6fa43e5c1d87736b0d 100644
--- a/Source/core/layout/LayoutButton.h
+++ b/Source/core/layout/LayoutButton.h
@@ -32,28 +32,28 @@ namespace blink {
 class LayoutButton final : public LayoutFlexibleBox {
 public:
     explicit LayoutButton(Element*);
-    virtual ~LayoutButton();
+    ~LayoutButton() override;
 
-    virtual const char* name() const override { return "LayoutButton"; }
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutButton || LayoutFlexibleBox::isOfType(type); }
+    const char* name() const override { return "LayoutButton"; }
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutButton || LayoutFlexibleBox::isOfType(type); }
 
-    virtual bool canBeSelectionLeaf() const override { return node() && node()->hasEditableStyle(); }
-    virtual bool canCollapseAnonymousBlockChild() const override { return true; }
+    bool canBeSelectionLeaf() const override { return node() && node()->hasEditableStyle(); }
+    bool canCollapseAnonymousBlockChild() const override { return true; }
 
-    virtual void addChild(LayoutObject* newChild, LayoutObject *beforeChild = nullptr) override;
-    virtual void removeChild(LayoutObject*) override;
-    virtual void removeLeftoverAnonymousBlock(LayoutBlock*) override { }
-    virtual bool createsAnonymousWrapper() const override { return true; }
+    void addChild(LayoutObject* newChild, LayoutObject *beforeChild = nullptr) override;
+    void removeChild(LayoutObject*) override;
+    void removeLeftoverAnonymousBlock(LayoutBlock*) override { }
+    bool createsAnonymousWrapper() const override { return true; }
 
-    virtual bool hasControlClip() const override;
-    virtual LayoutRect controlClipRect(const LayoutPoint&) const override;
+    bool hasControlClip() const override;
+    LayoutRect controlClipRect(const LayoutPoint&) const override;
 
-    virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode) const override;
+    int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode) const override;
 
 private:
-    virtual void updateAnonymousChildStyle(const LayoutObject& child, ComputedStyle& childStyle) const override;
+    void updateAnonymousChildStyle(const LayoutObject& child, ComputedStyle& childStyle) const override;
 
-    virtual bool hasLineIfEmpty() const override { return isHTMLInputElement(node()); }
+    bool hasLineIfEmpty() const override { return isHTMLInputElement(node()); }
 
     LayoutBlock* m_inner;
 };