Update XML classes to use OVERRIDE / FINAL when needed

Source/core/xml/XMLHttpRequestProgressEvent.h

Index: Source/core/xml/XMLHttpRequestProgressEvent.h
diff --git a/Source/core/xml/XMLHttpRequestProgressEvent.h b/Source/core/xml/XMLHttpRequestProgressEvent.h
index c6ab4a4dbd8f2181dcac09fe0c315c37cb7c2bc6..f6365158c1bd13bb93b9ff817972bc9d6af8c2cd 100644
--- a/Source/core/xml/XMLHttpRequestProgressEvent.h
+++ b/Source/core/xml/XMLHttpRequestProgressEvent.h
@@ -32,7 +32,7 @@
 
 namespace WebCore {
 
-class XMLHttpRequestProgressEvent : public ProgressEvent {
+class XMLHttpRequestProgressEvent FINAL : public ProgressEvent {
 public:
     static PassRefPtr<XMLHttpRequestProgressEvent> create()
     {
@@ -47,7 +47,7 @@ public:
     unsigned long long position() const { return loaded(); }
     unsigned long long totalSize() const { return total(); }
 
-    virtual const AtomicString& interfaceName() const { return EventNames::XMLHttpRequestProgressEvent; }
+    virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::XMLHttpRequestProgressEvent; }
 
 private:
     XMLHttpRequestProgressEvent()