Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderButton.h

Index: Source/core/rendering/RenderButton.h
diff --git a/Source/core/rendering/RenderButton.h b/Source/core/rendering/RenderButton.h
index 33df32be802a8f87f11eef3d996b0bca8f59b725..5107efa98c809e78cab5709529d1857b42cc90c3 100644
--- a/Source/core/rendering/RenderButton.h
+++ b/Source/core/rendering/RenderButton.h
@@ -36,15 +36,15 @@ public:
     explicit RenderButton(Element*);
     virtual ~RenderButton();
 
-    virtual const char* renderName() const { return "RenderButton"; }
-    virtual bool isRenderButton() const { return true; }
+    virtual const char* renderName() const OVERRIDE { return "RenderButton"; }
+    virtual bool isRenderButton() const OVERRIDE { return true; }
 
     virtual bool canBeSelectionLeaf() const OVERRIDE { return node() && node()->rendererIsEditable(); }
 
-    virtual void addChild(RenderObject* newChild, RenderObject *beforeChild = 0);
-    virtual void removeChild(RenderObject*);
-    virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
-    virtual bool createsAnonymousWrapper() const { return true; }
+    virtual void addChild(RenderObject* newChild, RenderObject *beforeChild = 0) OVERRIDE;
+    virtual void removeChild(RenderObject*) OVERRIDE;
+    virtual void removeLeftoverAnonymousBlock(RenderBlock*) OVERRIDE { }
+    virtual bool createsAnonymousWrapper() const OVERRIDE { return true; }
 
     void setupInnerStyle(RenderStyle*);
 
@@ -52,16 +52,16 @@ public:
     virtual bool canHaveWhitespaceChildren() const OVERRIDE { return true; }
 
     virtual bool canHaveGeneratedChildren() const OVERRIDE;
-    virtual bool hasControlClip() const { return true; }
-    virtual LayoutRect controlClipRect(const LayoutPoint&) const;
+    virtual bool hasControlClip() const OVERRIDE { return true; }
+    virtual LayoutRect controlClipRect(const LayoutPoint&) const OVERRIDE;
 
     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode) const OVERRIDE;
 
 private:
-    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
-    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
+    virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle) OVERRIDE;
+    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
 
-    virtual bool hasLineIfEmpty() const { return node() && node()->hasTagName(HTMLNames::inputTag); }
+    virtual bool hasLineIfEmpty() const OVERRIDE { return node() && node()->hasTagName(HTMLNames::inputTag); }
 
     RenderBlock* m_inner;
 };