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

Source/WebCore/dom/Event.cpp

Index: Source/WebCore/dom/Event.cpp
diff --git a/Source/WebCore/dom/Event.cpp b/Source/WebCore/dom/Event.cpp
index d5d1fbe3758b84f40842838783f9d02f8145af5c..1673de9459fc2379a5a9fdc1d84e338279e80bd9 100644
--- a/Source/WebCore/dom/Event.cpp
+++ b/Source/WebCore/dom/Event.cpp
@@ -52,6 +52,7 @@ Event::Event()
     , m_currentTarget(0)
     , m_createTime(convertSecondsToDOMTimeStamp(currentTime()))
 {
+    ScriptWrappable::init(this);
 }
 
 Event::Event(const AtomicString& eventType, bool canBubbleArg, bool cancelableArg)
@@ -67,6 +68,7 @@ Event::Event(const AtomicString& eventType, bool canBubbleArg, bool cancelableAr
     , m_currentTarget(0)
     , m_createTime(convertSecondsToDOMTimeStamp(currentTime()))
 {
+    ScriptWrappable::init(this);
 }
 
 Event::Event(const AtomicString& eventType, const EventInit& initializer)
@@ -82,6 +84,7 @@ Event::Event(const AtomicString& eventType, const EventInit& initializer)
     , m_currentTarget(0)
     , m_createTime(convertSecondsToDOMTimeStamp(currentTime()))
 {
+    ScriptWrappable::init(this);
 }
 
 Event::~Event()