Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index c531b068265e146d5922e723a715e783c29a4855..b460bf71565bf9ec2da312048e9f80560cccb648 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -235,7 +235,7 @@ public:
 
     virtual KURL baseURI() const OVERRIDE FINAL;
 
-    virtual String nodeName() const;
+    virtual String nodeName() const OVERRIDE;
 
     PassRefPtr<Element> cloneElementWithChildren();
     PassRefPtr<Element> cloneElementWithoutChildren();
@@ -466,7 +466,7 @@ public:
     virtual bool isPasswordGeneratorButtonElement() const { return false; }
     virtual bool isClearButtonElement() const { return false; }
 
-    virtual bool canContainRangeEndPoint() const { return true; }
+    virtual bool canContainRangeEndPoint() const OVERRIDE { return true; }
 
     virtual const AtomicString& formControlType() const { return nullAtom; }
 
@@ -639,14 +639,14 @@ private:
     void attributeChangedFromParserOrByCloning(const QualifiedName&, const AtomicString&, AttributeModificationReason);
 
 #ifndef NDEBUG
-    virtual void formatForDebugger(char* buffer, unsigned length) const;
+    virtual void formatForDebugger(char* buffer, unsigned length) const OVERRIDE;
 #endif
 
     bool pseudoStyleCacheIsInvalid(const RenderStyle* currentStyle, RenderStyle* newStyle);
 
     void cancelFocusAppearanceUpdate();
 
-    virtual RenderStyle* virtualComputedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) { return computedStyle(pseudoElementSpecifier); }
+    virtual RenderStyle* virtualComputedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) OVERRIDE { return computedStyle(pseudoElementSpecifier); }
 
     inline void updateCallbackSelectors(RenderStyle* oldStyle, RenderStyle* newStyle);
     inline void removeCallbackSelectors();