First part of work to move V8 binding integrity off of vtables.

Source/WebCore/xml/XMLHttpRequestProgressEvent.h

Index: Source/WebCore/xml/XMLHttpRequestProgressEvent.h
diff --git a/Source/WebCore/xml/XMLHttpRequestProgressEvent.h b/Source/WebCore/xml/XMLHttpRequestProgressEvent.h
index d887a269432b1761cb4043cb1ae5b0acb5a4671b..bd3deb701b2a366f6321566eb064d6bb915ad733 100644
--- a/Source/WebCore/xml/XMLHttpRequestProgressEvent.h
+++ b/Source/WebCore/xml/XMLHttpRequestProgressEvent.h
@@ -50,10 +50,15 @@ public:
     virtual const AtomicString& interfaceName() const { return eventNames().interfaceForXMLHttpRequestProgressEvent; }
 
 private:
-    XMLHttpRequestProgressEvent() { }
+    XMLHttpRequestProgressEvent()
+    {
+        ScriptWrappable::init(this);
+    }
+
     XMLHttpRequestProgressEvent(const AtomicString& type, bool lengthComputable, unsigned long long loaded, unsigned long long total)
         : ProgressEvent(type, lengthComputable, loaded, total)
     {
+        ScriptWrappable::init(this);
     }
 };