Update DOM classes to use OVERRIDE / FINAL when needed

Source/core/dom/Comment.h

Index: Source/core/dom/Comment.h
diff --git a/Source/core/dom/Comment.h b/Source/core/dom/Comment.h
index b0625f4be12f5a77d4a21ab9fd7ba2c043f0bd6a..2d17b606ba5ca4b1b1ec2a66dd8c4942881dd176 100644
--- a/Source/core/dom/Comment.h
+++ b/Source/core/dom/Comment.h
@@ -36,10 +36,10 @@ public:
 private:
     Comment(Document&, const String&);
 
-    virtual String nodeName() const;
-    virtual NodeType nodeType() const;
-    virtual PassRefPtr<Node> cloneNode(bool deep = true);
-    virtual bool childTypeAllowed(NodeType) const;
+    virtual String nodeName() const OVERRIDE;
+    virtual NodeType nodeType() const OVERRIDE;
+    virtual PassRefPtr<Node> cloneNode(bool deep = true) OVERRIDE;
+    virtual bool childTypeAllowed(NodeType) const OVERRIDE;
 };
 
 DEFINE_NODE_TYPE_CASTS(Comment, nodeType() == Node::COMMENT_NODE);