Update CSS classes to use OVERRIDE / FINAL when needed

Source/core/css/CSSStyleRule.h

Index: Source/core/css/CSSStyleRule.h
diff --git a/Source/core/css/CSSStyleRule.h b/Source/core/css/CSSStyleRule.h
index 12b4562f03940158442b7972ffcee6090e66fbf2..605917987171e797bc63e1300345fce3a28c3d18 100644
--- a/Source/core/css/CSSStyleRule.h
+++ b/Source/core/css/CSSStyleRule.h
@@ -30,13 +30,13 @@ class CSSStyleDeclaration;
 class StyleRuleCSSStyleDeclaration;
 class StyleRule;
 
-class CSSStyleRule : public CSSRule {
+class CSSStyleRule FINAL : public CSSRule {
 public:
     static PassRefPtr<CSSStyleRule> create(StyleRule* rule, CSSStyleSheet* sheet) { return adoptRef(new CSSStyleRule(rule, sheet)); }
 
     virtual ~CSSStyleRule();
 
-    virtual CSSRule::Type type() const { return STYLE_RULE; }
+    virtual CSSRule::Type type() const OVERRIDE { return STYLE_RULE; }
     virtual String cssText() const OVERRIDE;
     virtual void reattach(StyleRuleBase*) OVERRIDE;