Update XML classes to use OVERRIDE / FINAL when needed

Source/core/xml/NativeXPathNSResolver.h

Index: Source/core/xml/NativeXPathNSResolver.h
diff --git a/Source/core/xml/NativeXPathNSResolver.h b/Source/core/xml/NativeXPathNSResolver.h
index 79523100b4d205c94af6603a1331cd941e38651d..45d5a66e9428a61dad9899e6bfc7d10238b91a0a 100644
--- a/Source/core/xml/NativeXPathNSResolver.h
+++ b/Source/core/xml/NativeXPathNSResolver.h
@@ -33,7 +33,7 @@ namespace WebCore {
 
 class Node;
 
-class NativeXPathNSResolver : public XPathNSResolver {
+class NativeXPathNSResolver FINAL : public XPathNSResolver {
 public:
     static PassRefPtr<NativeXPathNSResolver> create(PassRefPtr<Node> node) { return adoptRef(new NativeXPathNSResolver(node)); }
     virtual ~NativeXPathNSResolver();