Update HTML classes to use OVERRIDE / FINAL when needed

Source/core/html/HTMLButtonElement.h

Index: Source/core/html/HTMLButtonElement.h
diff --git a/Source/core/html/HTMLButtonElement.h b/Source/core/html/HTMLButtonElement.h
index 5032c3869753ee543c093e3045f1c6d8d5f7e34e..48aba2e2f24dad4c2849a27d99e01158da492781 100644
--- a/Source/core/html/HTMLButtonElement.h
+++ b/Source/core/html/HTMLButtonElement.h
@@ -43,34 +43,34 @@ private:
 
     enum Type { SUBMIT, RESET, BUTTON };
 
-    virtual const AtomicString& formControlType() const;
+    virtual const AtomicString& formControlType() const OVERRIDE;
 
-    virtual RenderObject* createRenderer(RenderStyle*);
+    virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
 
     // HTMLFormControlElement always creates one, but buttons don't need it.
     virtual bool alwaysCreateUserAgentShadowRoot() const OVERRIDE { return false; }
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
-    virtual void defaultEventHandler(Event*);
+    virtual void defaultEventHandler(Event*) OVERRIDE;
 
-    virtual bool appendFormData(FormDataList&, bool);
+    virtual bool appendFormData(FormDataList&, bool) OVERRIDE;
 
-    virtual bool isEnumeratable() const { return true; }
+    virtual bool isEnumeratable() const OVERRIDE { return true; }
     virtual bool supportLabels() const OVERRIDE { return true; }
     virtual bool isInteractiveContent() const OVERRIDE;
 
     virtual bool canBeSuccessfulSubmitButton() const OVERRIDE;
-    virtual bool isActivatedSubmit() const;
-    virtual void setActivatedSubmit(bool flag);
+    virtual bool isActivatedSubmit() const OVERRIDE;
+    virtual void setActivatedSubmit(bool flag) OVERRIDE;
 
-    virtual void accessKeyAction(bool sendMouseEvents);
+    virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 
-    virtual bool canStartSelection() const { return false; }
+    virtual bool canStartSelection() const OVERRIDE { return false; }
 
-    virtual bool isOptionalFormControl() const { return true; }
-    virtual bool recalcWillValidate() const;
+    virtual bool isOptionalFormControl() const OVERRIDE { return true; }
+    virtual bool recalcWillValidate() const OVERRIDE;
 
     Type m_type;
     bool m_isActivatedSubmit;