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

Source/WebCore/dom/BeforeLoadEvent.h

Index: Source/WebCore/dom/BeforeLoadEvent.h
diff --git a/Source/WebCore/dom/BeforeLoadEvent.h b/Source/WebCore/dom/BeforeLoadEvent.h
index 3289712d2aee83abafba696e360385cf6322a06c..78202b4574c6eda3c391d12dc6d9c1dda2a8b61a 100644
--- a/Source/WebCore/dom/BeforeLoadEvent.h
+++ b/Source/WebCore/dom/BeforeLoadEvent.h
@@ -64,18 +64,21 @@ public:
 private:
     BeforeLoadEvent()
     {
+        ScriptWrappable::init(this);
     }
 
     explicit BeforeLoadEvent(const String& url)
         : Event(eventNames().beforeloadEvent, false, true)
         , m_url(url)
     {
+        ScriptWrappable::init(this);
     }
 
     BeforeLoadEvent(const AtomicString& type, const BeforeLoadEventInit& initializer)
         : Event(type, initializer)
         , m_url(initializer.url)
     {
+        ScriptWrappable::init(this);
     }
 
     String m_url;